Finding the Fourth Proportional to 726,663.72, 1,002,787.98 and 399,969.75

Step by Step Solution

1. Step 1: Write the proportion equation
   726,663.72 : 1,002,787.98 = 399,969.75 : x
2. Step 2: Convert to fraction form
   726,663.72/1,002,787.98 = 399,969.75/x
3. Step 3: Cross multiply
   726,663.72x = 1,002,787.98 × 399,969.75
4. Step 4: Simplify right side
   726,663.72x = 401,084,850,649.82
5. Step 5: Solve for x
   x = 401,084,850,649.82/726,663.72
6. Step 6: Final answer
   x = 551,953.87