Finding the Fourth Proportional to 6,811.52, 10,215.84 and 3,111.32

Step by Step Solution

1. Step 1: Write the proportion equation
   6,811.52 : 10,215.84 = 3,111.32 : x
2. Step 2: Convert to fraction form
   6,811.52/10,215.84 = 3,111.32/x
3. Step 3: Cross multiply
   6,811.52x = 10,215.84 × 3,111.32
4. Step 4: Simplify right side
   6,811.52x = 31,784,747.31
5. Step 5: Solve for x
   x = 31,784,747.31/6,811.52
6. Step 6: Final answer
   x = 4,666.32