Finding the Fourth Proportional to 826,784.72, 1,240,354.16 and 287,057.87

Step by Step Solution

1. Step 1: Write the proportion equation
   826,784.72 : 1,240,354.16 = 287,057.87 : x
2. Step 2: Convert to fraction form
   826,784.72/1,240,354.16 = 287,057.87/x
3. Step 3: Cross multiply
   826,784.72x = 1,240,354.16 × 287,057.87
4. Step 4: Simplify right side
   826,784.72x = 356,053,429,897.67
5. Step 5: Solve for x
   x = 356,053,429,897.67/826,784.72
6. Step 6: Final answer
   x = 430,648.30