Finding the Fourth Proportional to 8,665.18, 12,997.64 and 2,091.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,665.18 : 12,997.64 = 2,091.31 : x
2. Step 2: Convert to fraction form
   8,665.18/12,997.64 = 2,091.31/x
3. Step 3: Cross multiply
   8,665.18x = 12,997.64 × 2,091.31
4. Step 4: Simplify right side
   8,665.18x = 27,182,094.51
5. Step 5: Solve for x
   x = 27,182,094.51/8,665.18
6. Step 6: Final answer
   x = 3,136.93