Finding the Fourth Proportional to 1,189,320.82, 1,641,263.57 and 645,456.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189,320.82 : 1,641,263.57 = 645,456.47 : x
2. Step 2: Convert to fraction form
   1,189,320.82/1,641,263.57 = 645,456.47/x
3. Step 3: Cross multiply
   1,189,320.82x = 1,641,263.57 × 645,456.47
4. Step 4: Simplify right side
   1,189,320.82x = 1,059,364,187,004.52
5. Step 5: Solve for x
   x = 1,059,364,187,004.52/1,189,320.82
6. Step 6: Final answer
   x = 890,730.38