Finding the Fourth Proportional to 1,231,499.10, 1,699,497.60 and 687,616.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,231,499.10 : 1,699,497.60 = 687,616.50 : x
2. Step 2: Convert to fraction form
   1,231,499.10/1,699,497.60 = 687,616.50/x
3. Step 3: Cross multiply
   1,231,499.10x = 1,699,497.60 × 687,616.50
4. Step 4: Simplify right side
   1,231,499.10x = 1,168,602,591,470.40
5. Step 5: Solve for x
   x = 1,168,602,591,470.40/1,231,499.10
6. Step 6: Final answer
   x = 948,926.87