Finding the Fourth Proportional to 99.60, 149.37 and 38.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99.60 : 149.37 = 38.72 : x
2. Step 2: Convert to fraction form
   99.60/149.37 = 38.72/x
3. Step 3: Cross multiply
   99.60x = 149.37 × 38.72
4. Step 4: Simplify right side
   99.60x = 5,783.61
5. Step 5: Solve for x
   x = 5,783.61/99.60
6. Step 6: Final answer
   x = 58.07