Finding the Fourth Proportional to 82.10, 123.72 and 73.98

Step by Step Solution

1. Step 1: Write the proportion equation
   82.10 : 123.72 = 73.98 : x
2. Step 2: Convert to fraction form
   82.10/123.72 = 73.98/x
3. Step 3: Cross multiply
   82.10x = 123.72 × 73.98
4. Step 4: Simplify right side
   82.10x = 9,152.53
5. Step 5: Solve for x
   x = 9,152.53/82.10
6. Step 6: Final answer
   x = 111.48