Finding the Fourth Proportional to 9,218.94, 12,718.80 and 5,680.86

Step by Step Solution

1. Step 1: Write the proportion equation
   9,218.94 : 12,718.80 = 5,680.86 : x
2. Step 2: Convert to fraction form
   9,218.94/12,718.80 = 5,680.86/x
3. Step 3: Cross multiply
   9,218.94x = 12,718.80 × 5,680.86
4. Step 4: Simplify right side
   9,218.94x = 72,253,722.17
5. Step 5: Solve for x
   x = 72,253,722.17/9,218.94
6. Step 6: Final answer
   x = 7,837.53