Finding the Fourth Proportional to 13,776.45, 19,014.50 and 8,400.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,776.45 : 19,014.50 = 8,400.69 : x
2. Step 2: Convert to fraction form
   13,776.45/19,014.50 = 8,400.69/x
3. Step 3: Cross multiply
   13,776.45x = 19,014.50 × 8,400.69
4. Step 4: Simplify right side
   13,776.45x = 159,734,840.27
5. Step 5: Solve for x
   x = 159,734,840.27/13,776.45
6. Step 6: Final answer
   x = 11,594.77