Finding the Fourth Proportional to 7,880.10, 10,872.39 and 5,487.39

Step by Step Solution

1. Step 1: Write the proportion equation
   7,880.10 : 10,872.39 = 5,487.39 : x
2. Step 2: Convert to fraction form
   7,880.10/10,872.39 = 5,487.39/x
3. Step 3: Cross multiply
   7,880.10x = 10,872.39 × 5,487.39
4. Step 4: Simplify right side
   7,880.10x = 59,661,043.91
5. Step 5: Solve for x
   x = 59,661,043.91/7,880.10
6. Step 6: Final answer
   x = 7,571.10