Finding the Fourth Proportional to 90.18, 124.29 and 71.82

Step by Step Solution

1. Step 1: Write the proportion equation
   90.18 : 124.29 = 71.82 : x
2. Step 2: Convert to fraction form
   90.18/124.29 = 71.82/x
3. Step 3: Cross multiply
   90.18x = 124.29 × 71.82
4. Step 4: Simplify right side
   90.18x = 8,926.51
5. Step 5: Solve for x
   x = 8,926.51/90.18
6. Step 6: Final answer
   x = 98.99