Finding the Fourth Proportional to 142,111.91, 196,114.47 and 78,449.75

Step by Step Solution

1. Step 1: Write the proportion equation
   142,111.91 : 196,114.47 = 78,449.75 : x
2. Step 2: Convert to fraction form
   142,111.91/196,114.47 = 78,449.75/x
3. Step 3: Cross multiply
   142,111.91x = 196,114.47 × 78,449.75
4. Step 4: Simplify right side
   142,111.91x = 15,385,131,142.88
5. Step 5: Solve for x
   x = 15,385,131,142.88/142,111.91
6. Step 6: Final answer
   x = 108,260.67