Finding the Fourth Proportional to 99.01, 148.38 and 71.88

Step by Step Solution

1. Step 1: Write the proportion equation
   99.01 : 148.38 = 71.88 : x
2. Step 2: Convert to fraction form
   99.01/148.38 = 71.88/x
3. Step 3: Cross multiply
   99.01x = 148.38 × 71.88
4. Step 4: Simplify right side
   99.01x = 10,665.55
5. Step 5: Solve for x
   x = 10,665.55/99.01
6. Step 6: Final answer
   x = 107.72