Finding the Fourth Proportional to 1,189,222.80, 1,641,128.52 and 645,358.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189,222.80 : 1,641,128.52 = 645,358.59 : x
2. Step 2: Convert to fraction form
   1,189,222.80/1,641,128.52 = 645,358.59/x
3. Step 3: Cross multiply
   1,189,222.80x = 1,641,128.52 × 645,358.59
4. Step 4: Simplify right side
   1,189,222.80x = 1,059,116,388,281.01
5. Step 5: Solve for x
   x = 1,059,116,388,281.01/1,189,222.80
6. Step 6: Final answer
   x = 890,595.42