Finding the Fourth Proportional to 12,776.32, 17,631.12 and 7,111

Step by Step Solution

1. Step 1: Write the proportion equation
   12,776.32 : 17,631.12 = 7,111 : x
2. Step 2: Convert to fraction form
   12,776.32/17,631.12 = 7,111/x
3. Step 3: Cross multiply
   12,776.32x = 17,631.12 × 7,111
4. Step 4: Simplify right side
   12,776.32x = 125,374,894.32
5. Step 5: Solve for x
   x = 125,374,894.32/12,776.32
6. Step 6: Final answer
   x = 9,813.07