Finding the Fourth Proportional to 158,721.91, 219,042.56 and 87,104.50

Step by Step Solution

1. Step 1: Write the proportion equation
   158,721.91 : 219,042.56 = 87,104.50 : x
2. Step 2: Convert to fraction form
   158,721.91/219,042.56 = 87,104.50/x
3. Step 3: Cross multiply
   158,721.91x = 219,042.56 × 87,104.50
4. Step 4: Simplify right side
   158,721.91x = 19,079,592,667.52
5. Step 5: Solve for x
   x = 19,079,592,667.52/158,721.91
6. Step 6: Final answer
   x = 120,207.68