Finding the Fourth Proportional to 142,654.65, 196,861.01 and 78,991.08

Step by Step Solution

1. Step 1: Write the proportion equation
   142,654.65 : 196,861.01 = 78,991.08 : x
2. Step 2: Convert to fraction form
   142,654.65/196,861.01 = 78,991.08/x
3. Step 3: Cross multiply
   142,654.65x = 196,861.01 × 78,991.08
4. Step 4: Simplify right side
   142,654.65x = 15,550,262,410.53
5. Step 5: Solve for x
   x = 15,550,262,410.53/142,654.65
6. Step 6: Final answer
   x = 109,006.35