Finding the Fourth Proportional to 100.88, 139.02 and 73.22

Step by Step Solution

1. Step 1: Write the proportion equation
   100.88 : 139.02 = 73.22 : x
2. Step 2: Convert to fraction form
   100.88/139.02 = 73.22/x
3. Step 3: Cross multiply
   100.88x = 139.02 × 73.22
4. Step 4: Simplify right side
   100.88x = 10,179.04
5. Step 5: Solve for x
   x = 10,179.04/100.88
6. Step 6: Final answer
   x = 100.90