Finding the Fourth Proportional to 7,139.54, 10,709.51 and 5,515.89

Step by Step Solution

1. Step 1: Write the proportion equation
   7,139.54 : 10,709.51 = 5,515.89 : x
2. Step 2: Convert to fraction form
   7,139.54/10,709.51 = 5,515.89/x
3. Step 3: Cross multiply
   7,139.54x = 10,709.51 × 5,515.89
4. Step 4: Simplify right side
   7,139.54x = 59,072,451.53
5. Step 5: Solve for x
   x = 59,072,451.53/7,139.54
6. Step 6: Final answer
   x = 8,273.99