Finding the Fourth Proportional to 12,749.31, 19,131.45 and 5,353.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,749.31 : 19,131.45 = 5,353.20 : x
2. Step 2: Convert to fraction form
   12,749.31/19,131.45 = 5,353.20/x
3. Step 3: Cross multiply
   12,749.31x = 19,131.45 × 5,353.20
4. Step 4: Simplify right side
   12,749.31x = 102,414,478.14
5. Step 5: Solve for x
   x = 102,414,478.14/12,749.31
6. Step 6: Final answer
   x = 8,032.94