Finding the Fourth Proportional to 209,255.52, 288,818.72 and 137,642.24

Step by Step Solution

1. Step 1: Write the proportion equation
   209,255.52 : 288,818.72 = 137,642.24 : x
2. Step 2: Convert to fraction form
   209,255.52/288,818.72 = 137,642.24/x
3. Step 3: Cross multiply
   209,255.52x = 288,818.72 × 137,642.24
4. Step 4: Simplify right side
   209,255.52x = 39,753,655,574.73
5. Step 5: Solve for x
   x = 39,753,655,574.73/209,255.52
6. Step 6: Final answer
   x = 189,976.62