Finding the Fourth Proportional to 12,598.56, 17,390 and 7,879.84

Step by Step Solution

1. Step 1: Write the proportion equation
   12,598.56 : 17,390 = 7,879.84 : x
2. Step 2: Convert to fraction form
   12,598.56/17,390 = 7,879.84/x
3. Step 3: Cross multiply
   12,598.56x = 17,390 × 7,879.84
4. Step 4: Simplify right side
   12,598.56x = 137,030,417.60
5. Step 5: Solve for x
   x = 137,030,417.60/12,598.56
6. Step 6: Final answer
   x = 10,876.67