Finding the Fourth Proportional to 127.50, 191.28 and 91.32

Step by Step Solution

1. Step 1: Write the proportion equation
   127.50 : 191.28 = 91.32 : x
2. Step 2: Convert to fraction form
   127.50/191.28 = 91.32/x
3. Step 3: Cross multiply
   127.50x = 191.28 × 91.32
4. Step 4: Simplify right side
   127.50x = 17,467.69
5. Step 5: Solve for x
   x = 17,467.69/127.50
6. Step 6: Final answer
   x = 137.00