Finding the Fourth Proportional to 142,490.58, 196,619.96 and 78,819.72

Step by Step Solution

1. Step 1: Write the proportion equation
   142,490.58 : 196,619.96 = 78,819.72 : x
2. Step 2: Convert to fraction form
   142,490.58/196,619.96 = 78,819.72/x
3. Step 3: Cross multiply
   142,490.58x = 196,619.96 × 78,819.72
4. Step 4: Simplify right side
   142,490.58x = 15,497,530,193.61
5. Step 5: Solve for x
   x = 15,497,530,193.61/142,490.58
6. Step 6: Final answer
   x = 108,761.79