Finding the Fourth Proportional to 62.80, 86.69 and 57.94

Step by Step Solution

1. Step 1: Write the proportion equation
   62.80 : 86.69 = 57.94 : x
2. Step 2: Convert to fraction form
   62.80/86.69 = 57.94/x
3. Step 3: Cross multiply
   62.80x = 86.69 × 57.94
4. Step 4: Simplify right side
   62.80x = 5,022.82
5. Step 5: Solve for x
   x = 5,022.82/62.80
6. Step 6: Final answer
   x = 79.98