Finding the Fourth Proportional to 142,408.10, 213,644.55 and 83,213.30

Step by Step Solution

1. Step 1: Write the proportion equation
   142,408.10 : 213,644.55 = 83,213.30 : x
2. Step 2: Convert to fraction form
   142,408.10/213,644.55 = 83,213.30/x
3. Step 3: Cross multiply
   142,408.10x = 213,644.55 × 83,213.30
4. Step 4: Simplify right side
   142,408.10x = 17,778,068,032.52
5. Step 5: Solve for x
   x = 17,778,068,032.52/142,408.10
6. Step 6: Final answer
   x = 124,838.88