Finding the Fourth Proportional to 12,758.59, 17,605.93 and 7,980.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,758.59 : 17,605.93 = 7,980.69 : x
2. Step 2: Convert to fraction form
   12,758.59/17,605.93 = 7,980.69/x
3. Step 3: Cross multiply
   12,758.59x = 17,605.93 × 7,980.69
4. Step 4: Simplify right side
   12,758.59x = 140,507,469.49
5. Step 5: Solve for x
   x = 140,507,469.49/12,758.59
6. Step 6: Final answer
   x = 11,012.77