Finding the Fourth Proportional to 72.18, 108.28 and 59.98

Step by Step Solution

1. Step 1: Write the proportion equation
   72.18 : 108.28 = 59.98 : x
2. Step 2: Convert to fraction form
   72.18/108.28 = 59.98/x
3. Step 3: Cross multiply
   72.18x = 108.28 × 59.98
4. Step 4: Simplify right side
   72.18x = 6,494.63
5. Step 5: Solve for x
   x = 6,494.63/72.18
6. Step 6: Final answer
   x = 89.98