Finding the Fourth Proportional to 142,420.10, 213,662.55 and 83,225.30

Step by Step Solution

1. Step 1: Write the proportion equation
   142,420.10 : 213,662.55 = 83,225.30 : x
2. Step 2: Convert to fraction form
   142,420.10/213,662.55 = 83,225.30/x
3. Step 3: Cross multiply
   142,420.10x = 213,662.55 × 83,225.30
4. Step 4: Simplify right side
   142,420.10x = 17,782,129,822.52
5. Step 5: Solve for x
   x = 17,782,129,822.52/142,420.10
6. Step 6: Final answer
   x = 124,856.88