Finding the Fourth Proportional to 8,515.38, 12,777.93 and 3,320.04

Step by Step Solution

1. Step 1: Write the proportion equation
   8,515.38 : 12,777.93 = 3,320.04 : x
2. Step 2: Convert to fraction form
   8,515.38/12,777.93 = 3,320.04/x
3. Step 3: Cross multiply
   8,515.38x = 12,777.93 × 3,320.04
4. Step 4: Simplify right side
   8,515.38x = 42,423,238.72
5. Step 5: Solve for x
   x = 42,423,238.72/8,515.38
6. Step 6: Final answer
   x = 4,981.95