Finding the Fourth Proportional to 1,189,322.10, 1,641,276.54 and 645,462.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189,322.10 : 1,641,276.54 = 645,462.72 : x
2. Step 2: Convert to fraction form
   1,189,322.10/1,641,276.54 = 645,462.72/x
3. Step 3: Cross multiply
   1,189,322.10x = 1,641,276.54 × 645,462.72
4. Step 4: Simplify right side
   1,189,322.10x = 1,059,382,819,780.59
5. Step 5: Solve for x
   x = 1,059,382,819,780.59/1,189,322.10
6. Step 6: Final answer
   x = 890,745.09