Finding the Third Proportional to 11,085.61 and 15,591.23

Step by Step Solution

1. Step 1: Write the proportion equation
   11,085.61 : 15,591.23 = 15,591.23 : x
2. Step 2: Convert to fraction form
   11,085.61/15,591.23 = 15,591.23/x
3. Step 3: Cross multiply
   11,085.61x = 15,591.23 × 15,591.23
4. Step 4: Simplify right side
   11,085.61x = 243,086,589.34
5. Step 5: Solve for x
   x = 243,086,589.34/11,085.61
6. Step 6: Final answer
   x = 21,928.12