Finding the Fourth Proportional to 142,553.33, 196,729.78 and 78,891.15

Step by Step Solution

1. Step 1: Write the proportion equation
   142,553.33 : 196,729.78 = 78,891.15 : x
2. Step 2: Convert to fraction form
   142,553.33/196,729.78 = 78,891.15/x
3. Step 3: Cross multiply
   142,553.33x = 196,729.78 × 78,891.15
4. Step 4: Simplify right side
   142,553.33x = 15,520,238,188.99
5. Step 5: Solve for x
   x = 15,520,238,188.99/142,553.33
6. Step 6: Final answer
   x = 108,873.21