Finding the Fourth Proportional to 12,989.10, 17,925.16 and 7,399.98

Step by Step Solution

1. Step 1: Write the proportion equation
   12,989.10 : 17,925.16 = 7,399.98 : x
2. Step 2: Convert to fraction form
   12,989.10/17,925.16 = 7,399.98/x
3. Step 3: Cross multiply
   12,989.10x = 17,925.16 × 7,399.98
4. Step 4: Simplify right side
   12,989.10x = 132,645,825.50
5. Step 5: Solve for x
   x = 132,645,825.50/12,989.10
6. Step 6: Final answer
   x = 10,212.09