Finding the Fourth Proportional to 12,776.30, 17,631.66 and 7,111.37

Step by Step Solution

1. Step 1: Write the proportion equation
   12,776.30 : 17,631.66 = 7,111.37 : x
2. Step 2: Convert to fraction form
   12,776.30/17,631.66 = 7,111.37/x
3. Step 3: Cross multiply
   12,776.30x = 17,631.66 × 7,111.37
4. Step 4: Simplify right side
   12,776.30x = 125,385,169.82
5. Step 5: Solve for x
   x = 125,385,169.82/12,776.30
6. Step 6: Final answer
   x = 9,813.89