Finding the Fourth Proportional to 127.42, 175.84 and 72.15

Step by Step Solution

1. Step 1: Write the proportion equation
   127.42 : 175.84 = 72.15 : x
2. Step 2: Convert to fraction form
   127.42/175.84 = 72.15/x
3. Step 3: Cross multiply
   127.42x = 175.84 × 72.15
4. Step 4: Simplify right side
   127.42x = 12,686.50
5. Step 5: Solve for x
   x = 12,686.50/127.42
6. Step 6: Final answer
   x = 99.57