Finding the Fourth Proportional to 17,854.47, 26,780.52 and 7,991.10

Step by Step Solution

1. Step 1: Write the proportion equation
   17,854.47 : 26,780.52 = 7,991.10 : x
2. Step 2: Convert to fraction form
   17,854.47/26,780.52 = 7,991.10/x
3. Step 3: Cross multiply
   17,854.47x = 26,780.52 × 7,991.10
4. Step 4: Simplify right side
   17,854.47x = 214,005,813.37
5. Step 5: Solve for x
   x = 214,005,813.37/17,854.47
6. Step 6: Final answer
   x = 11,986.12