Finding the Fourth Proportional to 142,218.39, 196,154.98 and 99,200.10

Step by Step Solution

1. Step 1: Write the proportion equation
   142,218.39 : 196,154.98 = 99,200.10 : x
2. Step 2: Convert to fraction form
   142,218.39/196,154.98 = 99,200.10/x
3. Step 3: Cross multiply
   142,218.39x = 196,154.98 × 99,200.10
4. Step 4: Simplify right side
   142,218.39x = 19,458,592,154.72
5. Step 5: Solve for x
   x = 19,458,592,154.72/142,218.39
6. Step 6: Final answer
   x = 136,821.92