Finding the Fourth Proportional to 98.72, 148.15 and 37.90

Step by Step Solution

1. Step 1: Write the proportion equation
   98.72 : 148.15 = 37.90 : x
2. Step 2: Convert to fraction form
   98.72/148.15 = 37.90/x
3. Step 3: Cross multiply
   98.72x = 148.15 × 37.90
4. Step 4: Simplify right side
   98.72x = 5,614.89
5. Step 5: Solve for x
   x = 5,614.89/98.72
6. Step 6: Final answer
   x = 56.88