Finding the Fourth Proportional to 13,540.62, 18,685.32 and 7,875.06

Step by Step Solution

1. Step 1: Write the proportion equation
   13,540.62 : 18,685.32 = 7,875.06 : x
2. Step 2: Convert to fraction form
   13,540.62/18,685.32 = 7,875.06/x
3. Step 3: Cross multiply
   13,540.62x = 18,685.32 × 7,875.06
4. Step 4: Simplify right side
   13,540.62x = 147,148,016.12
5. Step 5: Solve for x
   x = 147,148,016.12/13,540.62
6. Step 6: Final answer
   x = 10,867.15