Finding the Fourth Proportional to 12,802.50, 19,211.31 and 5,406.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,802.50 : 19,211.31 = 5,406.48 : x
2. Step 2: Convert to fraction form
   12,802.50/19,211.31 = 5,406.48/x
3. Step 3: Cross multiply
   12,802.50x = 19,211.31 × 5,406.48
4. Step 4: Simplify right side
   12,802.50x = 103,865,563.29
5. Step 5: Solve for x
   x = 103,865,563.29/12,802.50
6. Step 6: Final answer
   x = 8,112.91