Finding the Fourth Proportional to 7,921.68, 10,931.89 and 4,287.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,921.68 : 10,931.89 = 4,287.72 : x
2. Step 2: Convert to fraction form
   7,921.68/10,931.89 = 4,287.72/x
3. Step 3: Cross multiply
   7,921.68x = 10,931.89 × 4,287.72
4. Step 4: Simplify right side
   7,921.68x = 46,872,883.39
5. Step 5: Solve for x
   x = 46,872,883.39/7,921.68
6. Step 6: Final answer
   x = 5,917.04