Finding the Fourth Proportional to 13,212.78, 19,822.61 and 5,818.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,212.78 : 19,822.61 = 5,818.69 : x
2. Step 2: Convert to fraction form
   13,212.78/19,822.61 = 5,818.69/x
3. Step 3: Cross multiply
   13,212.78x = 19,822.61 × 5,818.69
4. Step 4: Simplify right side
   13,212.78x = 115,341,622.58
5. Step 5: Solve for x
   x = 115,341,622.58/13,212.78
6. Step 6: Final answer
   x = 8,729.55