Finding the Fourth Proportional to 90.30, 134.82 and 79.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90.30 : 134.82 = 79.50 : x
2. Step 2: Convert to fraction form
   90.30/134.82 = 79.50/x
3. Step 3: Cross multiply
   90.30x = 134.82 × 79.50
4. Step 4: Simplify right side
   90.30x = 10,718.19
5. Step 5: Solve for x
   x = 10,718.19/90.30
6. Step 6: Final answer
   x = 118.70