Finding the Fourth Proportional to 1,189,315.31, 1,641,255.98 and 645,450.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189,315.31 : 1,641,255.98 = 645,450.98 : x
2. Step 2: Convert to fraction form
   1,189,315.31/1,641,255.98 = 645,450.98/x
3. Step 3: Cross multiply
   1,189,315.31x = 1,641,255.98 × 645,450.98
4. Step 4: Simplify right side
   1,189,315.31x = 1,059,350,269,288.33
5. Step 5: Solve for x
   x = 1,059,350,269,288.33/1,189,315.31
6. Step 6: Final answer
   x = 890,722.80