Finding the Fourth Proportional to 1,224,585.60, 1,689,918.72 and 688,041.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,224,585.60 : 1,689,918.72 = 688,041.60 : x
2. Step 2: Convert to fraction form
   1,224,585.60/1,689,918.72 = 688,041.60/x
3. Step 3: Cross multiply
   1,224,585.60x = 1,689,918.72 × 688,041.60
4. Step 4: Simplify right side
   1,224,585.60x = 1,162,734,379,978.75
5. Step 5: Solve for x
   x = 1,162,734,379,978.75/1,224,585.60
6. Step 6: Final answer
   x = 949,492.12