Finding the Fourth Proportional to 100.98, 139.29 and 71.82

Step by Step Solution

1. Step 1: Write the proportion equation
   100.98 : 139.29 = 71.82 : x
2. Step 2: Convert to fraction form
   100.98/139.29 = 71.82/x
3. Step 3: Cross multiply
   100.98x = 139.29 × 71.82
4. Step 4: Simplify right side
   100.98x = 10,003.81
5. Step 5: Solve for x
   x = 10,003.81/100.98
6. Step 6: Final answer
   x = 99.07