Finding the Fourth Proportional to 130.37, 179.91 and 72.15

Step by Step Solution

1. Step 1: Write the proportion equation
   130.37 : 179.91 = 72.15 : x
2. Step 2: Convert to fraction form
   130.37/179.91 = 72.15/x
3. Step 3: Cross multiply
   130.37x = 179.91 × 72.15
4. Step 4: Simplify right side
   130.37x = 12,980.15
5. Step 5: Solve for x
   x = 12,980.15/130.37
6. Step 6: Final answer
   x = 99.56