Finding the Fourth Proportional to 12,881.59, 17,776.98 and 7,216.32

Step by Step Solution

1. Step 1: Write the proportion equation
   12,881.59 : 17,776.98 = 7,216.32 : x
2. Step 2: Convert to fraction form
   12,881.59/17,776.98 = 7,216.32/x
3. Step 3: Cross multiply
   12,881.59x = 17,776.98 × 7,216.32
4. Step 4: Simplify right side
   12,881.59x = 128,284,376.31
5. Step 5: Solve for x
   x = 128,284,376.31/12,881.59
6. Step 6: Final answer
   x = 9,958.74