Finding the Third Proportional to 11,915 and 17,731.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,915 : 17,731.50 = 17,731.50 : x
2. Step 2: Convert to fraction form
   11,915/17,731.50 = 17,731.50/x
3. Step 3: Cross multiply
   11,915x = 17,731.50 × 17,731.50
4. Step 4: Simplify right side
   11,915x = 314,406,092.25
5. Step 5: Solve for x
   x = 314,406,092.25/11,915
6. Step 6: Final answer
   x = 26,387.42