Finding the Third Proportional to 11,388 and 15,322.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,388 : 15,322.50 = 15,322.50 : x
2. Step 2: Convert to fraction form
   11,388/15,322.50 = 15,322.50/x
3. Step 3: Cross multiply
   11,388x = 15,322.50 × 15,322.50
4. Step 4: Simplify right side
   11,388x = 234,779,006.25
5. Step 5: Solve for x
   x = 234,779,006.25/11,388
6. Step 6: Final answer
   x = 20,616.35