Finding the Fourth Proportional to 12,796.65, 17,658.84 and 7,131.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,796.65 : 17,658.84 = 7,131.10 : x
2. Step 2: Convert to fraction form
   12,796.65/17,658.84 = 7,131.10/x
3. Step 3: Cross multiply
   12,796.65x = 17,658.84 × 7,131.10
4. Step 4: Simplify right side
   12,796.65x = 125,926,953.92
5. Step 5: Solve for x
   x = 125,926,953.92/12,796.65
6. Step 6: Final answer
   x = 9,840.62