Finding the Fourth Proportional to 729,002.79, 1,005,976.80 and 402,318.72

Step by Step Solution

1. Step 1: Write the proportion equation
   729,002.79 : 1,005,976.80 = 402,318.72 : x
2. Step 2: Convert to fraction form
   729,002.79/1,005,976.80 = 402,318.72/x
3. Step 3: Cross multiply
   729,002.79x = 1,005,976.80 × 402,318.72
4. Step 4: Simplify right side
   729,002.79x = 404,723,298,525.70
5. Step 5: Solve for x
   x = 404,723,298,525.70/729,002.79
6. Step 6: Final answer
   x = 555,173.87