Finding the Fourth Proportional to 1,189,422.45, 1,641,404.52 and 645,558.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189,422.45 : 1,641,404.52 = 645,558.18 : x
2. Step 2: Convert to fraction form
   1,189,422.45/1,641,404.52 = 645,558.18/x
3. Step 3: Cross multiply
   1,189,422.45x = 1,641,404.52 × 645,558.18
4. Step 4: Simplify right side
   1,189,422.45x = 1,059,622,114,574.97
5. Step 5: Solve for x
   x = 1,059,622,114,574.97/1,189,422.45
6. Step 6: Final answer
   x = 890,871.12