Finding the Fourth Proportional to 142,298.18, 196,363.76 and 78,631.88

Step by Step Solution

1. Step 1: Write the proportion equation
   142,298.18 : 196,363.76 = 78,631.88 : x
2. Step 2: Convert to fraction form
   142,298.18/196,363.76 = 78,631.88/x
3. Step 3: Cross multiply
   142,298.18x = 196,363.76 × 78,631.88
4. Step 4: Simplify right side
   142,298.18x = 15,440,450,237.69
5. Step 5: Solve for x
   x = 15,440,450,237.69/142,298.18
6. Step 6: Final answer
   x = 108,507.72