Finding the Fourth Proportional to 4,967.80, 7,439.55 and 3,315.40

Step by Step Solution

1. Step 1: Write the proportion equation
   4,967.80 : 7,439.55 = 3,315.40 : x
2. Step 2: Convert to fraction form
   4,967.80/7,439.55 = 3,315.40/x
3. Step 3: Cross multiply
   4,967.80x = 7,439.55 × 3,315.40
4. Step 4: Simplify right side
   4,967.80x = 24,665,084.07
5. Step 5: Solve for x
   x = 24,665,084.07/4,967.80
6. Step 6: Final answer
   x = 4,964.99