Finding the Fourth Proportional to 142,492.30, 196,638.51 and 78,828.73

Step by Step Solution

1. Step 1: Write the proportion equation
   142,492.30 : 196,638.51 = 78,828.73 : x
2. Step 2: Convert to fraction form
   142,492.30/196,638.51 = 78,828.73/x
3. Step 3: Cross multiply
   142,492.30x = 196,638.51 × 78,828.73
4. Step 4: Simplify right side
   142,492.30x = 15,500,764,012.39
5. Step 5: Solve for x
   x = 15,500,764,012.39/142,492.30
6. Step 6: Final answer
   x = 108,783.17