Finding the Fourth Proportional to 900,139.88, 1,350,874.42 and 426,826.91

Step by Step Solution

1. Step 1: Write the proportion equation
   900,139.88 : 1,350,874.42 = 426,826.91 : x
2. Step 2: Convert to fraction form
   900,139.88/1,350,874.42 = 426,826.91/x
3. Step 3: Cross multiply
   900,139.88x = 1,350,874.42 × 426,826.91
4. Step 4: Simplify right side
   900,139.88x = 576,589,546,665.20
5. Step 5: Solve for x
   x = 576,589,546,665.20/900,139.88
6. Step 6: Final answer
   x = 640,555.50