Finding the Fourth Proportional to 12,013.71, 16,581.88 and 7,769.51

Step by Step Solution

1. Step 1: Write the proportion equation
   12,013.71 : 16,581.88 = 7,769.51 : x
2. Step 2: Convert to fraction form
   12,013.71/16,581.88 = 7,769.51/x
3. Step 3: Cross multiply
   12,013.71x = 16,581.88 × 7,769.51
4. Step 4: Simplify right side
   12,013.71x = 128,833,082.48
5. Step 5: Solve for x
   x = 128,833,082.48/12,013.71
6. Step 6: Final answer
   x = 10,723.84