Finding the Fourth Proportional to 89.52, 123.50 and 64.99

Step by Step Solution

1. Step 1: Write the proportion equation
   89.52 : 123.50 = 64.99 : x
2. Step 2: Convert to fraction form
   89.52/123.50 = 64.99/x
3. Step 3: Cross multiply
   89.52x = 123.50 × 64.99
4. Step 4: Simplify right side
   89.52x = 8,026.58
5. Step 5: Solve for x
   x = 8,026.58/89.52
6. Step 6: Final answer
   x = 89.67