Finding the Third Proportional to 13,488 and 20,419.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,488 : 20,419.50 = 20,419.50 : x
2. Step 2: Convert to fraction form
   13,488/20,419.50 = 20,419.50/x
3. Step 3: Cross multiply
   13,488x = 20,419.50 × 20,419.50
4. Step 4: Simplify right side
   13,488x = 416,955,980.25
5. Step 5: Solve for x
   x = 416,955,980.25/13,488
6. Step 6: Final answer
   x = 30,913.11