Finding the Fourth Proportional to 101.34, 139.59 and 90.48

Step by Step Solution

1. Step 1: Write the proportion equation
   101.34 : 139.59 = 90.48 : x
2. Step 2: Convert to fraction form
   101.34/139.59 = 90.48/x
3. Step 3: Cross multiply
   101.34x = 139.59 × 90.48
4. Step 4: Simplify right side
   101.34x = 12,630.10
5. Step 5: Solve for x
   x = 12,630.10/101.34
6. Step 6: Final answer
   x = 124.63