Finding the Fourth Proportional to 13,685.38, 18,885.82 and 7,397.76

Step by Step Solution

1. Step 1: Write the proportion equation
   13,685.38 : 18,885.82 = 7,397.76 : x
2. Step 2: Convert to fraction form
   13,685.38/18,885.82 = 7,397.76/x
3. Step 3: Cross multiply
   13,685.38x = 18,885.82 × 7,397.76
4. Step 4: Simplify right side
   13,685.38x = 139,712,763.76
5. Step 5: Solve for x
   x = 139,712,763.76/13,685.38
6. Step 6: Final answer
   x = 10,208.91