Finding the Fourth Proportional to 1,128,826.30, 1,557,781.35 and 645,401.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128,826.30 : 1,557,781.35 = 645,401.57 : x
2. Step 2: Convert to fraction form
   1,128,826.30/1,557,781.35 = 645,401.57/x
3. Step 3: Cross multiply
   1,128,826.30x = 1,557,781.35 × 645,401.57
4. Step 4: Simplify right side
   1,128,826.30x = 1,005,394,529,006.72
5. Step 5: Solve for x
   x = 1,005,394,529,006.72/1,128,826.30
6. Step 6: Final answer
   x = 890,654.77