Finding the Third Proportional to 11,871.56 and 17,999.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,871.56 : 17,999.72 = 17,999.72 : x
2. Step 2: Convert to fraction form
   11,871.56/17,999.72 = 17,999.72/x
3. Step 3: Cross multiply
   11,871.56x = 17,999.72 × 17,999.72
4. Step 4: Simplify right side
   11,871.56x = 323,989,875.08
5. Step 5: Solve for x
   x = 323,989,875.08/11,871.56
6. Step 6: Final answer
   x = 27,291.26