Finding the Fourth Proportional to 82.16, 123.13 and 61.98

Step by Step Solution

1. Step 1: Write the proportion equation
   82.16 : 123.13 = 61.98 : x
2. Step 2: Convert to fraction form
   82.16/123.13 = 61.98/x
3. Step 3: Cross multiply
   82.16x = 123.13 × 61.98
4. Step 4: Simplify right side
   82.16x = 7,631.60
5. Step 5: Solve for x
   x = 7,631.60/82.16
6. Step 6: Final answer
   x = 92.89