Finding the Fourth Proportional to 13,141.71, 19,721.02 and 5,242.88

Step by Step Solution

1. Step 1: Write the proportion equation
   13,141.71 : 19,721.02 = 5,242.88 : x
2. Step 2: Convert to fraction form
   13,141.71/19,721.02 = 5,242.88/x
3. Step 3: Cross multiply
   13,141.71x = 19,721.02 × 5,242.88
4. Step 4: Simplify right side
   13,141.71x = 103,394,941.34
5. Step 5: Solve for x
   x = 103,394,941.34/13,141.71
6. Step 6: Final answer
   x = 7,867.69