Finding the Fourth Proportional to 13,142.71, 19,722.52 and 5,243.88

Step by Step Solution

1. Step 1: Write the proportion equation
   13,142.71 : 19,722.52 = 5,243.88 : x
2. Step 2: Convert to fraction form
   13,142.71/19,722.52 = 5,243.88/x
3. Step 3: Cross multiply
   13,142.71x = 19,722.52 × 5,243.88
4. Step 4: Simplify right side
   13,142.71x = 103,422,528.18
5. Step 5: Solve for x
   x = 103,422,528.18/13,142.71
6. Step 6: Final answer
   x = 7,869.19