Finding the Fourth Proportional to 142,078.91, 196,068.50 and 78,416.25

Step by Step Solution

1. Step 1: Write the proportion equation
   142,078.91 : 196,068.50 = 78,416.25 : x
2. Step 2: Convert to fraction form
   142,078.91/196,068.50 = 78,416.25/x
3. Step 3: Cross multiply
   142,078.91x = 196,068.50 × 78,416.25
4. Step 4: Simplify right side
   142,078.91x = 15,374,956,121.04
5. Step 5: Solve for x
   x = 15,374,956,121.04/142,078.91
6. Step 6: Final answer
   x = 108,214.21