Finding the Fourth Proportional to 99.79, 149.63 and 38.10

Step by Step Solution

1. Step 1: Write the proportion equation
   99.79 : 149.63 = 38.10 : x
2. Step 2: Convert to fraction form
   99.79/149.63 = 38.10/x
3. Step 3: Cross multiply
   99.79x = 149.63 × 38.10
4. Step 4: Simplify right side
   99.79x = 5,700.90
5. Step 5: Solve for x
   x = 5,700.90/99.79
6. Step 6: Final answer
   x = 57.13