Finding the Fourth Proportional to 12,599.56, 17,391.38 and 7,880.84

Step by Step Solution

1. Step 1: Write the proportion equation
   12,599.56 : 17,391.38 = 7,880.84 : x
2. Step 2: Convert to fraction form
   12,599.56/17,391.38 = 7,880.84/x
3. Step 3: Cross multiply
   12,599.56x = 17,391.38 × 7,880.84
4. Step 4: Simplify right side
   12,599.56x = 137,058,683.16
5. Step 5: Solve for x
   x = 137,058,683.16/12,599.56
6. Step 6: Final answer
   x = 10,878.05