Finding the Fourth Proportional to 1,149,443.12, 1,586,280.71 and 640,145.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,149,443.12 : 1,586,280.71 = 640,145.49 : x
2. Step 2: Convert to fraction form
   1,149,443.12/1,586,280.71 = 640,145.49/x
3. Step 3: Cross multiply
   1,149,443.12x = 1,586,280.71 × 640,145.49
4. Step 4: Simplify right side
   1,149,443.12x = 1,015,450,442,380.50
5. Step 5: Solve for x
   x = 1,015,450,442,380.50/1,149,443.12
6. Step 6: Final answer
   x = 883,428.18