Finding the Fourth Proportional to 142,812, 196,998.48 and 89,071.20

Step by Step Solution

1. Step 1: Write the proportion equation
   142,812 : 196,998.48 = 89,071.20 : x
2. Step 2: Convert to fraction form
   142,812/196,998.48 = 89,071.20/x
3. Step 3: Cross multiply
   142,812x = 196,998.48 × 89,071.20
4. Step 4: Simplify right side
   142,812x = 17,546,891,011.78
5. Step 5: Solve for x
   x = 17,546,891,011.78/142,812
6. Step 6: Final answer
   x = 122,867.06