Finding the Fourth Proportional to 1,189,222.71, 1,641,128.39 and 645,358.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189,222.71 : 1,641,128.39 = 645,358.50 : x
2. Step 2: Convert to fraction form
   1,189,222.71/1,641,128.39 = 645,358.50/x
3. Step 3: Cross multiply
   1,189,222.71x = 1,641,128.39 × 645,358.50
4. Step 4: Simplify right side
   1,189,222.71x = 1,059,116,153,588.39
5. Step 5: Solve for x
   x = 1,059,116,153,588.39/1,189,222.71
6. Step 6: Final answer
   x = 890,595.30