Finding the Fourth Proportional to 8,501.31, 11,727.72 and 5,518.08

Step by Step Solution

1. Step 1: Write the proportion equation
   8,501.31 : 11,727.72 = 5,518.08 : x
2. Step 2: Convert to fraction form
   8,501.31/11,727.72 = 5,518.08/x
3. Step 3: Cross multiply
   8,501.31x = 11,727.72 × 5,518.08
4. Step 4: Simplify right side
   8,501.31x = 64,714,497.18
5. Step 5: Solve for x
   x = 64,714,497.18/8,501.31
6. Step 6: Final answer
   x = 7,612.30