Finding the Fourth Proportional to 1,201,586,978.18, 1,802,583,964.80 and 414,426,902.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,201,586,978.18 : 1,802,583,964.80 = 414,426,902.55 : x
2. Step 2: Convert to fraction form
   1,201,586,978.18/1,802,583,964.80 = 414,426,902.55/x
3. Step 3: Cross multiply
   1,201,586,978.18x = 1,802,583,964.80 × 414,426,902.55
4. Step 4: Simplify right side
   1,201,586,978.18x = 747,039,289,118,362,240
5. Step 5: Solve for x
   x = 747,039,289,118,362,240/1,201,586,978.18
6. Step 6: Final answer
   x = 621,710,540.05