Finding the Third Proportional to 11,620 and 15,613.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,620 : 15,613.50 = 15,613.50 : x
2. Step 2: Convert to fraction form
   11,620/15,613.50 = 15,613.50/x
3. Step 3: Cross multiply
   11,620x = 15,613.50 × 15,613.50
4. Step 4: Simplify right side
   11,620x = 243,781,382.25
5. Step 5: Solve for x
   x = 243,781,382.25/11,620
6. Step 6: Final answer
   x = 20,979.46