Finding the Fourth Proportional to 13,685.67, 18,886.25 and 7,398.05

Step by Step Solution

1. Step 1: Write the proportion equation
   13,685.67 : 18,886.25 = 7,398.05 : x
2. Step 2: Convert to fraction form
   13,685.67/18,886.25 = 7,398.05/x
3. Step 3: Cross multiply
   13,685.67x = 18,886.25 × 7,398.05
4. Step 4: Simplify right side
   13,685.67x = 139,721,290.39
5. Step 5: Solve for x
   x = 139,721,290.39/13,685.67
6. Step 6: Final answer
   x = 10,209.31