Finding the Fourth Proportional to 1,189,498.81, 1,641,510.02 and 645,634.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189,498.81 : 1,641,510.02 = 645,634.72 : x
2. Step 2: Convert to fraction form
   1,189,498.81/1,641,510.02 = 645,634.72/x
3. Step 3: Cross multiply
   1,189,498.81x = 1,641,510.02 × 645,634.72
4. Step 4: Simplify right side
   1,189,498.81x = 1,059,815,870,422.62
5. Step 5: Solve for x
   x = 1,059,815,870,422.62/1,189,498.81
6. Step 6: Final answer
   x = 890,976.82