Finding the Fourth Proportional to 13,142.51, 19,721.94 and 5,351.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,142.51 : 19,721.94 = 5,351.31 : x
2. Step 2: Convert to fraction form
   13,142.51/19,721.94 = 5,351.31/x
3. Step 3: Cross multiply
   13,142.51x = 19,721.94 × 5,351.31
4. Step 4: Simplify right side
   13,142.51x = 105,538,214.74
5. Step 5: Solve for x
   x = 105,538,214.74/13,142.51
6. Step 6: Final answer
   x = 8,030.30