Finding the Fourth Proportional to 92.17, 137.59 and 91.32

Step by Step Solution

1. Step 1: Write the proportion equation
   92.17 : 137.59 = 91.32 : x
2. Step 2: Convert to fraction form
   92.17/137.59 = 91.32/x
3. Step 3: Cross multiply
   92.17x = 137.59 × 91.32
4. Step 4: Simplify right side
   92.17x = 12,564.72
5. Step 5: Solve for x
   x = 12,564.72/92.17
6. Step 6: Final answer
   x = 136.32