Finding the Fourth Proportional to 142,141.88, 196,155.67 and 78,480.07

Step by Step Solution

1. Step 1: Write the proportion equation
   142,141.88 : 196,155.67 = 78,480.07 : x
2. Step 2: Convert to fraction form
   142,141.88/196,155.67 = 78,480.07/x
3. Step 3: Cross multiply
   142,141.88x = 196,155.67 × 78,480.07
4. Step 4: Simplify right side
   142,141.88x = 15,394,310,712.50
5. Step 5: Solve for x
   x = 15,394,310,712.50/142,141.88
6. Step 6: Final answer
   x = 108,302.43