Finding the Fourth Proportional to 142,654.50, 196,860.79 and 78,990.93

Step by Step Solution

1. Step 1: Write the proportion equation
   142,654.50 : 196,860.79 = 78,990.93 : x
2. Step 2: Convert to fraction form
   142,654.50/196,860.79 = 78,990.93/x
3. Step 3: Cross multiply
   142,654.50x = 196,860.79 × 78,990.93
4. Step 4: Simplify right side
   142,654.50x = 15,550,216,243.15
5. Step 5: Solve for x
   x = 15,550,216,243.15/142,654.50
6. Step 6: Final answer
   x = 109,006.14