Finding the Fourth Proportional to 13,776.25, 19,013.31 and 8,401.81

Step by Step Solution

1. Step 1: Write the proportion equation
   13,776.25 : 19,013.31 = 8,401.81 : x
2. Step 2: Convert to fraction form
   13,776.25/19,013.31 = 8,401.81/x
3. Step 3: Cross multiply
   13,776.25x = 19,013.31 × 8,401.81
4. Step 4: Simplify right side
   13,776.25x = 159,746,149.55
5. Step 5: Solve for x
   x = 159,746,149.55/13,776.25
6. Step 6: Final answer
   x = 11,595.76