Finding the Fourth Proportional to 12,909.23, 19,365.86 and 5,513.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,909.23 : 19,365.86 = 5,513.72 : x
2. Step 2: Convert to fraction form
   12,909.23/19,365.86 = 5,513.72/x
3. Step 3: Cross multiply
   12,909.23x = 19,365.86 × 5,513.72
4. Step 4: Simplify right side
   12,909.23x = 106,777,950.45
5. Step 5: Solve for x
   x = 106,777,950.45/12,909.23
6. Step 6: Final answer
   x = 8,271.45