Finding the Fourth Proportional to 59.31, 81.87 and 42.99

Step by Step Solution

1. Step 1: Write the proportion equation
   59.31 : 81.87 = 42.99 : x
2. Step 2: Convert to fraction form
   59.31/81.87 = 42.99/x
3. Step 3: Cross multiply
   59.31x = 81.87 × 42.99
4. Step 4: Simplify right side
   59.31x = 3,519.59
5. Step 5: Solve for x
   x = 3,519.59/59.31
6. Step 6: Final answer
   x = 59.34