Finding the Fourth Proportional to 12,825.81, 17,699.63 and 7,788.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,825.81 : 17,699.63 = 7,788.69 : x
2. Step 2: Convert to fraction form
   12,825.81/17,699.63 = 7,788.69/x
3. Step 3: Cross multiply
   12,825.81x = 17,699.63 × 7,788.69
4. Step 4: Simplify right side
   12,825.81x = 137,856,892.24
5. Step 5: Solve for x
   x = 137,856,892.24/12,825.81
6. Step 6: Final answer
   x = 10,748.40