Finding the Fourth Proportional to 142,451.05, 196,587.59 and 78,789.30

Step by Step Solution

1. Step 1: Write the proportion equation
   142,451.05 : 196,587.59 = 78,789.30 : x
2. Step 2: Convert to fraction form
   142,451.05/196,587.59 = 78,789.30/x
3. Step 3: Cross multiply
   142,451.05x = 196,587.59 × 78,789.30
4. Step 4: Simplify right side
   142,451.05x = 15,488,998,210.84
5. Step 5: Solve for x
   x = 15,488,998,210.84/142,451.05
6. Step 6: Final answer
   x = 108,732.08