Finding the Fourth Proportional to 1,189,422.79, 1,641,404.99 and 645,558.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189,422.79 : 1,641,404.99 = 645,558.52 : x
2. Step 2: Convert to fraction form
   1,189,422.79/1,641,404.99 = 645,558.52/x
3. Step 3: Cross multiply
   1,189,422.79x = 1,641,404.99 × 645,558.52
4. Step 4: Simplify right side
   1,189,422.79x = 1,059,622,976,065.01
5. Step 5: Solve for x
   x = 1,059,622,976,065.01/1,189,422.79
6. Step 6: Final answer
   x = 890,871.59