Finding the Fourth Proportional to 99.26, 137.00 and 71.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99.26 : 137.00 = 71.72 : x
2. Step 2: Convert to fraction form
   99.26/137.00 = 71.72/x
3. Step 3: Cross multiply
   99.26x = 137.00 × 71.72
4. Step 4: Simplify right side
   99.26x = 9,825.28
5. Step 5: Solve for x
   x = 9,825.28/99.26
6. Step 6: Final answer
   x = 98.99