Finding the Fourth Proportional to 64.86, 89.46 and 42.99

Step by Step Solution

1. Step 1: Write the proportion equation
   64.86 : 89.46 = 42.99 : x
2. Step 2: Convert to fraction form
   64.86/89.46 = 42.99/x
3. Step 3: Cross multiply
   64.86x = 89.46 × 42.99
4. Step 4: Simplify right side
   64.86x = 3,845.89
5. Step 5: Solve for x
   x = 3,845.89/64.86
6. Step 6: Final answer
   x = 59.30