Finding the Fourth Proportional to 687,443.32, 948,459.18 and 400,760.47

Step by Step Solution

1. Step 1: Write the proportion equation
   687,443.32 : 948,459.18 = 400,760.47 : x
2. Step 2: Convert to fraction form
   687,443.32/948,459.18 = 400,760.47/x
3. Step 3: Cross multiply
   687,443.32x = 948,459.18 × 400,760.47
4. Step 4: Simplify right side
   687,443.32x = 380,104,946,752.62
5. Step 5: Solve for x
   x = 380,104,946,752.62/687,443.32
6. Step 6: Final answer
   x = 552,925.51