Finding the Fourth Proportional to 71.75, 99 and 56.18

Step by Step Solution

1. Step 1: Write the proportion equation
   71.75 : 99 = 56.18 : x
2. Step 2: Convert to fraction form
   71.75/99 = 56.18/x
3. Step 3: Cross multiply
   71.75x = 99 × 56.18
4. Step 4: Simplify right side
   71.75x = 5,561.82
5. Step 5: Solve for x
   x = 5,561.82/71.75
6. Step 6: Final answer
   x = 77.52