Finding the Fourth Proportional to 142,407.10, 213,643.05 and 83,212.30

Step by Step Solution

1. Step 1: Write the proportion equation
   142,407.10 : 213,643.05 = 83,212.30 : x
2. Step 2: Convert to fraction form
   142,407.10/213,643.05 = 83,212.30/x
3. Step 3: Cross multiply
   142,407.10x = 213,643.05 × 83,212.30
4. Step 4: Simplify right side
   142,407.10x = 17,777,729,569.52
5. Step 5: Solve for x
   x = 17,777,729,569.52/142,407.10
6. Step 6: Final answer
   x = 124,837.38