Finding the Fourth Proportional to 8,921.86, 12,317.82 and 5,736.64

Step by Step Solution

1. Step 1: Write the proportion equation
   8,921.86 : 12,317.82 = 5,736.64 : x
2. Step 2: Convert to fraction form
   8,921.86/12,317.82 = 5,736.64/x
3. Step 3: Cross multiply
   8,921.86x = 12,317.82 × 5,736.64
4. Step 4: Simplify right side
   8,921.86x = 70,662,898.92
5. Step 5: Solve for x
   x = 70,662,898.92/8,921.86
6. Step 6: Final answer
   x = 7,920.20