Finding the Fourth Proportional to 42.89, 64.31 and 14.00

Step by Step Solution

1. Step 1: Write the proportion equation
   42.89 : 64.31 = 14.00 : x
2. Step 2: Convert to fraction form
   42.89/64.31 = 14.00/x
3. Step 3: Cross multiply
   42.89x = 64.31 × 14.00
4. Step 4: Simplify right side
   42.89x = 899.95
5. Step 5: Solve for x
   x = 899.95/42.89
6. Step 6: Final answer
   x = 20.99