Finding the Fourth Proportional to 1,128,373.89, 1,557,155.94 and 644,949.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128,373.89 : 1,557,155.94 = 644,949.42 : x
2. Step 2: Convert to fraction form
   1,128,373.89/1,557,155.94 = 644,949.42/x
3. Step 3: Cross multiply
   1,128,373.89x = 1,557,155.94 × 644,949.42
4. Step 4: Simplify right side
   1,128,373.89x = 1,004,286,820,352.55
5. Step 5: Solve for x
   x = 1,004,286,820,352.55/1,128,373.89
6. Step 6: Final answer
   x = 890,030.18