Finding the Fourth Proportional to 42.90, 59.16 and 42.49

Step by Step Solution

1. Step 1: Write the proportion equation
   42.90 : 59.16 = 42.49 : x
2. Step 2: Convert to fraction form
   42.90/59.16 = 42.49/x
3. Step 3: Cross multiply
   42.90x = 59.16 × 42.49
4. Step 4: Simplify right side
   42.90x = 2,513.71
5. Step 5: Solve for x
   x = 2,513.71/42.90
6. Step 6: Final answer
   x = 58.59