Finding the Fourth Proportional to 12,976.66, 17,906.71 and 7,309.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,976.66 : 17,906.71 = 7,309.60 : x
2. Step 2: Convert to fraction form
   12,976.66/17,906.71 = 7,309.60/x
3. Step 3: Cross multiply
   12,976.66x = 17,906.71 × 7,309.60
4. Step 4: Simplify right side
   12,976.66x = 130,890,887.42
5. Step 5: Solve for x
   x = 130,890,887.42/12,976.66
6. Step 6: Final answer
   x = 10,086.64