Finding the Fourth Proportional to 12,890.86, 17,789.32 and 7,854.03

Step by Step Solution

1. Step 1: Write the proportion equation
   12,890.86 : 17,789.32 = 7,854.03 : x
2. Step 2: Convert to fraction form
   12,890.86/17,789.32 = 7,854.03/x
3. Step 3: Cross multiply
   12,890.86x = 17,789.32 × 7,854.03
4. Step 4: Simplify right side
   12,890.86x = 139,717,862.78
5. Step 5: Solve for x
   x = 139,717,862.78/12,890.86
6. Step 6: Final answer
   x = 10,838.52