Finding the Fourth Proportional to 142,083.50, 196,074.24 and 78,421.28

Step by Step Solution

1. Step 1: Write the proportion equation
   142,083.50 : 196,074.24 = 78,421.28 : x
2. Step 2: Convert to fraction form
   142,083.50/196,074.24 = 78,421.28/x
3. Step 3: Cross multiply
   142,083.50x = 196,074.24 × 78,421.28
4. Step 4: Simplify right side
   142,083.50x = 15,376,392,875.83
5. Step 5: Solve for x
   x = 15,376,392,875.83/142,083.50
6. Step 6: Final answer
   x = 108,220.82