Finding the Fourth Proportional to 142,503.32, 196,640.83 and 78,839.75

Step by Step Solution

1. Step 1: Write the proportion equation
   142,503.32 : 196,640.83 = 78,839.75 : x
2. Step 2: Convert to fraction form
   142,503.32/196,640.83 = 78,839.75/x
3. Step 3: Cross multiply
   142,503.32x = 196,640.83 × 78,839.75
4. Step 4: Simplify right side
   142,503.32x = 15,503,114,171.50
5. Step 5: Solve for x
   x = 15,503,114,171.50/142,503.32
6. Step 6: Final answer
   x = 108,791.25