Finding the Third Proportional to 11,730 and 15,718.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,730 : 15,718.50 = 15,718.50 : x
2. Step 2: Convert to fraction form
   11,730/15,718.50 = 15,718.50/x
3. Step 3: Cross multiply
   11,730x = 15,718.50 × 15,718.50
4. Step 4: Simplify right side
   11,730x = 247,071,242.25
5. Step 5: Solve for x
   x = 247,071,242.25/11,730
6. Step 6: Final answer
   x = 21,063.19