Finding the Fourth Proportional to 13,210.48, 18,229.89 and 7,908.22

Step by Step Solution

1. Step 1: Write the proportion equation
   13,210.48 : 18,229.89 = 7,908.22 : x
2. Step 2: Convert to fraction form
   13,210.48/18,229.89 = 7,908.22/x
3. Step 3: Cross multiply
   13,210.48x = 18,229.89 × 7,908.22
4. Step 4: Simplify right side
   13,210.48x = 144,165,889.55
5. Step 5: Solve for x
   x = 144,165,889.55/13,210.48
6. Step 6: Final answer
   x = 10,913.00