Finding the Fourth Proportional to 1,189,537.57, 1,641,563.31 and 645,673.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189,537.57 : 1,641,563.31 = 645,673.33 : x
2. Step 2: Convert to fraction form
   1,189,537.57/1,641,563.31 = 645,673.33/x
3. Step 3: Cross multiply
   1,189,537.57x = 1,641,563.31 × 645,673.33
4. Step 4: Simplify right side
   1,189,537.57x = 1,059,913,648,773.52
5. Step 5: Solve for x
   x = 1,059,913,648,773.52/1,189,537.57
6. Step 6: Final answer
   x = 891,029.99