Finding the Fourth Proportional to 1,189,222.82, 1,641,128.54 and 645,358.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189,222.82 : 1,641,128.54 = 645,358.61 : x
2. Step 2: Convert to fraction form
   1,189,222.82/1,641,128.54 = 645,358.61/x
3. Step 3: Cross multiply
   1,189,222.82x = 1,641,128.54 × 645,358.61
4. Step 4: Simplify right side
   1,189,222.82x = 1,059,116,433,405.73
5. Step 5: Solve for x
   x = 1,059,116,433,405.73/1,189,222.82
6. Step 6: Final answer
   x = 890,595.45