Finding the Fourth Proportional to 142,111.80, 196,113.33 and 78,449.58

Step by Step Solution

1. Step 1: Write the proportion equation
   142,111.80 : 196,113.33 = 78,449.58 : x
2. Step 2: Convert to fraction form
   142,111.80/196,113.33 = 78,449.58/x
3. Step 3: Cross multiply
   142,111.80x = 196,113.33 × 78,449.58
4. Step 4: Simplify right side
   142,111.80x = 15,385,008,370.90
5. Step 5: Solve for x
   x = 15,385,008,370.90/142,111.80
6. Step 6: Final answer
   x = 108,259.89