Finding the Fourth Proportional to 12,929.52, 19,405.32 and 5,143.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,929.52 : 19,405.32 = 5,143.80 : x
2. Step 2: Convert to fraction form
   12,929.52/19,405.32 = 5,143.80/x
3. Step 3: Cross multiply
   12,929.52x = 19,405.32 × 5,143.80
4. Step 4: Simplify right side
   12,929.52x = 99,817,085.02
5. Step 5: Solve for x
   x = 99,817,085.02/12,929.52
6. Step 6: Final answer
   x = 7,720.09