Finding the Fourth Proportional to 100.88, 139.10 and 76.03

Step by Step Solution

1. Step 1: Write the proportion equation
   100.88 : 139.10 = 76.03 : x
2. Step 2: Convert to fraction form
   100.88/139.10 = 76.03/x
3. Step 3: Cross multiply
   100.88x = 139.10 × 76.03
4. Step 4: Simplify right side
   100.88x = 10,575.77
5. Step 5: Solve for x
   x = 10,575.77/100.88
6. Step 6: Final answer
   x = 104.84