Finding the Fourth Proportional to 13,123.41, 18,108.36 and 7,818.09

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.41 : 18,108.36 = 7,818.09 : x
2. Step 2: Convert to fraction form
   13,123.41/18,108.36 = 7,818.09/x
3. Step 3: Cross multiply
   13,123.41x = 18,108.36 × 7,818.09
4. Step 4: Simplify right side
   13,123.41x = 141,572,788.23
5. Step 5: Solve for x
   x = 141,572,788.23/13,123.41
6. Step 6: Final answer
   x = 10,787.81