Finding the Fourth Proportional to 142,109.91, 196,111.71 and 78,447.75

Step by Step Solution

1. Step 1: Write the proportion equation
   142,109.91 : 196,111.71 = 78,447.75 : x
2. Step 2: Convert to fraction form
   142,109.91/196,111.71 = 78,447.75/x
3. Step 3: Cross multiply
   142,109.91x = 196,111.71 × 78,447.75
4. Step 4: Simplify right side
   142,109.91x = 15,384,522,398.15
5. Step 5: Solve for x
   x = 15,384,522,398.15/142,109.91
6. Step 6: Final answer
   x = 108,257.91