Finding the Fourth Proportional to 90.19, 123.69 and 86.46

Step by Step Solution

1. Step 1: Write the proportion equation
   90.19 : 123.69 = 86.46 : x
2. Step 2: Convert to fraction form
   90.19/123.69 = 86.46/x
3. Step 3: Cross multiply
   90.19x = 123.69 × 86.46
4. Step 4: Simplify right side
   90.19x = 10,694.86
5. Step 5: Solve for x
   x = 10,694.86/90.19
6. Step 6: Final answer
   x = 118.59