Finding the Fourth Proportional to 90.56, 124.98 and 78.32

Step by Step Solution

1. Step 1: Write the proportion equation
   90.56 : 124.98 = 78.32 : x
2. Step 2: Convert to fraction form
   90.56/124.98 = 78.32/x
3. Step 3: Cross multiply
   90.56x = 124.98 × 78.32
4. Step 4: Simplify right side
   90.56x = 9,788.43
5. Step 5: Solve for x
   x = 9,788.43/90.56
6. Step 6: Final answer
   x = 108.09