Finding the Fourth Proportional to 142,131.20, 213,139.20 and 48,588.80

Step by Step Solution

1. Step 1: Write the proportion equation
   142,131.20 : 213,139.20 = 48,588.80 : x
2. Step 2: Convert to fraction form
   142,131.20/213,139.20 = 48,588.80/x
3. Step 3: Cross multiply
   142,131.20x = 213,139.20 × 48,588.80
4. Step 4: Simplify right side
   142,131.20x = 10,356,177,960.96
5. Step 5: Solve for x
   x = 10,356,177,960.96/142,131.20
6. Step 6: Final answer
   x = 72,863.51