Finding the Fourth Proportional to 1,200,399,181.87, 1,656,724,146.79 and 691,664,460.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200,399,181.87 : 1,656,724,146.79 = 691,664,460.30 : x
2. Step 2: Convert to fraction form
   1,200,399,181.87/1,656,724,146.79 = 691,664,460.30/x
3. Step 3: Cross multiply
   1,200,399,181.87x = 1,656,724,146.79 × 691,664,460.30
4. Step 4: Simplify right side
   1,200,399,181.87x = 1,145,897,212,855,483,264
5. Step 5: Solve for x
   x = 1,145,897,212,855,483,264/1,200,399,181.87
6. Step 6: Final answer
   x = 954,596,795.93