Finding the Fourth Proportional to 90.15, 135.18 and 73.82

Step by Step Solution

1. Step 1: Write the proportion equation
   90.15 : 135.18 = 73.82 : x
2. Step 2: Convert to fraction form
   90.15/135.18 = 73.82/x
3. Step 3: Cross multiply
   90.15x = 135.18 × 73.82
4. Step 4: Simplify right side
   90.15x = 9,978.31
5. Step 5: Solve for x
   x = 9,978.31/90.15
6. Step 6: Final answer
   x = 110.69