Finding the Fourth Proportional to 12,898.72, 17,799.60 and 7,309.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,898.72 : 17,799.60 = 7,309.60 : x
2. Step 2: Convert to fraction form
   12,898.72/17,799.60 = 7,309.60/x
3. Step 3: Cross multiply
   12,898.72x = 17,799.60 × 7,309.60
4. Step 4: Simplify right side
   12,898.72x = 130,107,956.16
5. Step 5: Solve for x
   x = 130,107,956.16/12,898.72
6. Step 6: Final answer
   x = 10,086.89