Finding the Fourth Proportional to 1,128,454.72, 1,557,267.34 and 645,030.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128,454.72 : 1,557,267.34 = 645,030.24 : x
2. Step 2: Convert to fraction form
   1,128,454.72/1,557,267.34 = 645,030.24/x
3. Step 3: Cross multiply
   1,128,454.72x = 1,557,267.34 × 645,030.24
4. Step 4: Simplify right side
   1,128,454.72x = 1,004,484,522,839.21
5. Step 5: Solve for x
   x = 1,004,484,522,839.21/1,128,454.72
6. Step 6: Final answer
   x = 890,141.63