Finding the Fourth Proportional to 13,685.88, 18,886.52 and 7,398.25

Step by Step Solution

1. Step 1: Write the proportion equation
   13,685.88 : 18,886.52 = 7,398.25 : x
2. Step 2: Convert to fraction form
   13,685.88/18,886.52 = 7,398.25/x
3. Step 3: Cross multiply
   13,685.88x = 18,886.52 × 7,398.25
4. Step 4: Simplify right side
   13,685.88x = 139,727,196.59
5. Step 5: Solve for x
   x = 139,727,196.59/13,685.88
6. Step 6: Final answer
   x = 10,209.59