Finding the Fourth Proportional to 130.21, 179.69 and 72.00

Step by Step Solution

1. Step 1: Write the proportion equation
   130.21 : 179.69 = 72.00 : x
2. Step 2: Convert to fraction form
   130.21/179.69 = 72.00/x
3. Step 3: Cross multiply
   130.21x = 179.69 × 72.00
4. Step 4: Simplify right side
   130.21x = 12,936.78
5. Step 5: Solve for x
   x = 12,936.78/130.21
6. Step 6: Final answer
   x = 99.35