Finding the Fourth Proportional to 142,416.10, 213,656.55 and 83,221.30

Step by Step Solution

1. Step 1: Write the proportion equation
   142,416.10 : 213,656.55 = 83,221.30 : x
2. Step 2: Convert to fraction form
   142,416.10/213,656.55 = 83,221.30/x
3. Step 3: Cross multiply
   142,416.10x = 213,656.55 × 83,221.30
4. Step 4: Simplify right side
   142,416.10x = 17,780,775,844.52
5. Step 5: Solve for x
   x = 17,780,775,844.52/142,416.10
6. Step 6: Final answer
   x = 124,850.88