Finding the Fourth Proportional to 1,189,636.43, 1,641,700.37 and 645,772.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189,636.43 : 1,641,700.37 = 645,772.59 : x
2. Step 2: Convert to fraction form
   1,189,636.43/1,641,700.37 = 645,772.59/x
3. Step 3: Cross multiply
   1,189,636.43x = 1,641,700.37 × 645,772.59
4. Step 4: Simplify right side
   1,189,636.43x = 1,060,165,096,710.00
5. Step 5: Solve for x
   x = 1,060,165,096,710.00/1,189,636.43
6. Step 6: Final answer
   x = 891,167.31