Finding the Fourth Proportional to 142,391.06, 196,503.59 and 78,731.13

Step by Step Solution

1. Step 1: Write the proportion equation
   142,391.06 : 196,503.59 = 78,731.13 : x
2. Step 2: Convert to fraction form
   142,391.06/196,503.59 = 78,731.13/x
3. Step 3: Cross multiply
   142,391.06x = 196,503.59 × 78,731.13
4. Step 4: Simplify right side
   142,391.06x = 15,470,949,886.58
5. Step 5: Solve for x
   x = 15,470,949,886.58/142,391.06
6. Step 6: Final answer
   x = 108,651.14