Finding the Fourth Proportional to 919,872.72, 1,380,036.89 and 440,465.31

Step by Step Solution

1. Step 1: Write the proportion equation
   919,872.72 : 1,380,036.89 = 440,465.31 : x
2. Step 2: Convert to fraction form
   919,872.72/1,380,036.89 = 440,465.31/x
3. Step 3: Cross multiply
   919,872.72x = 1,380,036.89 × 440,465.31
4. Step 4: Simplify right side
   919,872.72x = 607,858,377,666.45
5. Step 5: Solve for x
   x = 607,858,377,666.45/919,872.72
6. Step 6: Final answer
   x = 660,807.05