Finding the Fourth Proportional to 90.18, 134.60 and 78.03

Step by Step Solution

1. Step 1: Write the proportion equation
   90.18 : 134.60 = 78.03 : x
2. Step 2: Convert to fraction form
   90.18/134.60 = 78.03/x
3. Step 3: Cross multiply
   90.18x = 134.60 × 78.03
4. Step 4: Simplify right side
   90.18x = 10,502.45
5. Step 5: Solve for x
   x = 10,502.45/90.18
6. Step 6: Final answer
   x = 116.46