Finding the Fourth Proportional to 142,654.90, 196,861.35 and 78,991.33

Step by Step Solution

1. Step 1: Write the proportion equation
   142,654.90 : 196,861.35 = 78,991.33 : x
2. Step 2: Convert to fraction form
   142,654.90/196,861.35 = 78,991.33/x
3. Step 3: Cross multiply
   142,654.90x = 196,861.35 × 78,991.33
4. Step 4: Simplify right side
   142,654.90x = 15,550,338,877.79
5. Step 5: Solve for x
   x = 15,550,338,877.79/142,654.90
6. Step 6: Final answer
   x = 109,006.70