Finding the Fourth Proportional to 728,738.78, 1,005,656.18 and 402,042.89

Step by Step Solution

1. Step 1: Write the proportion equation
   728,738.78 : 1,005,656.18 = 402,042.89 : x
2. Step 2: Convert to fraction form
   728,738.78/1,005,656.18 = 402,042.89/x
3. Step 3: Cross multiply
   728,738.78x = 1,005,656.18 × 402,042.89
4. Step 4: Simplify right side
   728,738.78x = 404,316,920,849.72
5. Step 5: Solve for x
   x = 404,316,920,849.72/728,738.78
6. Step 6: Final answer
   x = 554,817.36