Finding the Fourth Proportional to 8,646.72, 11,931.78 and 5,109.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,646.72 : 11,931.78 = 5,109.30 : x
2. Step 2: Convert to fraction form
   8,646.72/11,931.78 = 5,109.30/x
3. Step 3: Cross multiply
   8,646.72x = 11,931.78 × 5,109.30
4. Step 4: Simplify right side
   8,646.72x = 60,963,043.55
5. Step 5: Solve for x
   x = 60,963,043.55/8,646.72
6. Step 6: Final answer
   x = 7,050.42