Finding the Fourth Proportional to 13,488.72, 18,612.69 and 7,822.26

Step by Step Solution

1. Step 1: Write the proportion equation
   13,488.72 : 18,612.69 = 7,822.26 : x
2. Step 2: Convert to fraction form
   13,488.72/18,612.69 = 7,822.26/x
3. Step 3: Cross multiply
   13,488.72x = 18,612.69 × 7,822.26
4. Step 4: Simplify right side
   13,488.72x = 145,593,300.48
5. Step 5: Solve for x
   x = 145,593,300.48/13,488.72
6. Step 6: Final answer
   x = 10,793.71