Finding the Fourth Proportional to 99.72, 149.43 and 59.10

Step by Step Solution

1. Step 1: Write the proportion equation
   99.72 : 149.43 = 59.10 : x
2. Step 2: Convert to fraction form
   99.72/149.43 = 59.10/x
3. Step 3: Cross multiply
   99.72x = 149.43 × 59.10
4. Step 4: Simplify right side
   99.72x = 8,831.31
5. Step 5: Solve for x
   x = 8,831.31/99.72
6. Step 6: Final answer
   x = 88.56