Finding the Fourth Proportional to 83.01, 124.56 and 57.39

Step by Step Solution

1. Step 1: Write the proportion equation
   83.01 : 124.56 = 57.39 : x
2. Step 2: Convert to fraction form
   83.01/124.56 = 57.39/x
3. Step 3: Cross multiply
   83.01x = 124.56 × 57.39
4. Step 4: Simplify right side
   83.01x = 7,148.50
5. Step 5: Solve for x
   x = 7,148.50/83.01
6. Step 6: Final answer
   x = 86.12