Finding the Fourth Proportional to 154,711.31, 213,501.61 and 87,643.31

Step by Step Solution

1. Step 1: Write the proportion equation
   154,711.31 : 213,501.61 = 87,643.31 : x
2. Step 2: Convert to fraction form
   154,711.31/213,501.61 = 87,643.31/x
3. Step 3: Cross multiply
   154,711.31x = 213,501.61 × 87,643.31
4. Step 4: Simplify right side
   154,711.31x = 18,711,988,434.04
5. Step 5: Solve for x
   x = 18,711,988,434.04/154,711.31
6. Step 6: Final answer
   x = 120,947.77