Finding the Fourth Proportional to 142,368.80, 196,488.60 and 81,938.30

Step by Step Solution

1. Step 1: Write the proportion equation
   142,368.80 : 196,488.60 = 81,938.30 : x
2. Step 2: Convert to fraction form
   142,368.80/196,488.60 = 81,938.30/x
3. Step 3: Cross multiply
   142,368.80x = 196,488.60 × 81,938.30
4. Step 4: Simplify right side
   142,368.80x = 16,099,941,853.38
5. Step 5: Solve for x
   x = 16,099,941,853.38/142,368.80
6. Step 6: Final answer
   x = 113,086.17