Finding the Fourth Proportional to 13,488.39, 18,613.60 and 7,822.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,488.39 : 18,613.60 = 7,822.78 : x
2. Step 2: Convert to fraction form
   13,488.39/18,613.60 = 7,822.78/x
3. Step 3: Cross multiply
   13,488.39x = 18,613.60 × 7,822.78
4. Step 4: Simplify right side
   13,488.39x = 145,610,031.72
5. Step 5: Solve for x
   x = 145,610,031.72/13,488.39
6. Step 6: Final answer
   x = 10,795.22