Finding the Fourth Proportional to 89.39, 123.33 and 72.99

Step by Step Solution

1. Step 1: Write the proportion equation
   89.39 : 123.33 = 72.99 : x
2. Step 2: Convert to fraction form
   89.39/123.33 = 72.99/x
3. Step 3: Cross multiply
   89.39x = 123.33 × 72.99
4. Step 4: Simplify right side
   89.39x = 9,001.86
5. Step 5: Solve for x
   x = 9,001.86/89.39
6. Step 6: Final answer
   x = 100.70