Finding the Fourth Proportional to 100.96, 139.04 and 76.48

Step by Step Solution

1. Step 1: Write the proportion equation
   100.96 : 139.04 = 76.48 : x
2. Step 2: Convert to fraction form
   100.96/139.04 = 76.48/x
3. Step 3: Cross multiply
   100.96x = 139.04 × 76.48
4. Step 4: Simplify right side
   100.96x = 10,633.78
5. Step 5: Solve for x
   x = 10,633.78/100.96
6. Step 6: Final answer
   x = 105.33