Finding the Fourth Proportional to 12,805.83, 19,211.99 and 5,406.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,805.83 : 19,211.99 = 5,406.48 : x
2. Step 2: Convert to fraction form
   12,805.83/19,211.99 = 5,406.48/x
3. Step 3: Cross multiply
   12,805.83x = 19,211.99 × 5,406.48
4. Step 4: Simplify right side
   12,805.83x = 103,869,212.66
5. Step 5: Solve for x
   x = 103,869,212.66/12,805.83
6. Step 6: Final answer
   x = 8,111.09