Finding the Fourth Proportional to 12,216.86, 16,869.63 and 7,748.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,216.86 : 16,869.63 = 7,748.56 : x
2. Step 2: Convert to fraction form
   12,216.86/16,869.63 = 7,748.56/x
3. Step 3: Cross multiply
   12,216.86x = 16,869.63 × 7,748.56
4. Step 4: Simplify right side
   12,216.86x = 130,715,390.38
5. Step 5: Solve for x
   x = 130,715,390.38/12,216.86
6. Step 6: Final answer
   x = 10,699.59