Finding the Fourth Proportional to 99.98, 149.86 and 72.91

Step by Step Solution

1. Step 1: Write the proportion equation
   99.98 : 149.86 = 72.91 : x
2. Step 2: Convert to fraction form
   99.98/149.86 = 72.91/x
3. Step 3: Cross multiply
   99.98x = 149.86 × 72.91
4. Step 4: Simplify right side
   99.98x = 10,926.29
5. Step 5: Solve for x
   x = 10,926.29/99.98
6. Step 6: Final answer
   x = 109.28