Finding the Fourth Proportional to 12,976.30, 17,886.77 and 9,191.27

Step by Step Solution

1. Step 1: Write the proportion equation
   12,976.30 : 17,886.77 = 9,191.27 : x
2. Step 2: Convert to fraction form
   12,976.30/17,886.77 = 9,191.27/x
3. Step 3: Cross multiply
   12,976.30x = 17,886.77 × 9,191.27
4. Step 4: Simplify right side
   12,976.30x = 164,402,217.43
5. Step 5: Solve for x
   x = 164,402,217.43/12,976.30
6. Step 6: Final answer
   x = 12,669.42