Finding the Fourth Proportional to 13,691.71, 18,894.54 and 7,404.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,691.71 : 18,894.54 = 7,404.10 : x
2. Step 2: Convert to fraction form
   13,691.71/18,894.54 = 7,404.10/x
3. Step 3: Cross multiply
   13,691.71x = 18,894.54 × 7,404.10
4. Step 4: Simplify right side
   13,691.71x = 139,897,063.61
5. Step 5: Solve for x
   x = 139,897,063.61/13,691.71
6. Step 6: Final answer
   x = 10,217.65