Finding the Fourth Proportional to 103.06, 142.23 and 72.10

Step by Step Solution

1. Step 1: Write the proportion equation
   103.06 : 142.23 = 72.10 : x
2. Step 2: Convert to fraction form
   103.06/142.23 = 72.10/x
3. Step 3: Cross multiply
   103.06x = 142.23 × 72.10
4. Step 4: Simplify right side
   103.06x = 10,254.78
5. Step 5: Solve for x
   x = 10,254.78/103.06
6. Step 6: Final answer
   x = 99.50