Finding the Fourth Proportional to 12,980.85, 17,913.65 and 7,315.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,980.85 : 17,913.65 = 7,315.69 : x
2. Step 2: Convert to fraction form
   12,980.85/17,913.65 = 7,315.69/x
3. Step 3: Cross multiply
   12,980.85x = 17,913.65 × 7,315.69
4. Step 4: Simplify right side
   12,980.85x = 131,050,628.81
5. Step 5: Solve for x
   x = 131,050,628.81/12,980.85
6. Step 6: Final answer
   x = 10,095.69