Finding the Fourth Proportional to 928,909.68, 1,281,830.04 and 520,980.72

Step by Step Solution

1. Step 1: Write the proportion equation
   928,909.68 : 1,281,830.04 = 520,980.72 : x
2. Step 2: Convert to fraction form
   928,909.68/1,281,830.04 = 520,980.72/x
3. Step 3: Cross multiply
   928,909.68x = 1,281,830.04 × 520,980.72
4. Step 4: Simplify right side
   928,909.68x = 667,808,737,156.83
5. Step 5: Solve for x
   x = 667,808,737,156.83/928,909.68
6. Step 6: Final answer
   x = 718,916.76