Finding the Fourth Proportional to 82.48, 123.48 and 61.12

Step by Step Solution

1. Step 1: Write the proportion equation
   82.48 : 123.48 = 61.12 : x
2. Step 2: Convert to fraction form
   82.48/123.48 = 61.12/x
3. Step 3: Cross multiply
   82.48x = 123.48 × 61.12
4. Step 4: Simplify right side
   82.48x = 7,547.10
5. Step 5: Solve for x
   x = 7,547.10/82.48
6. Step 6: Final answer
   x = 91.50