Finding the Third Proportional to 12,558 and 21,388.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,558 : 21,388.50 = 21,388.50 : x
2. Step 2: Convert to fraction form
   12,558/21,388.50 = 21,388.50/x
3. Step 3: Cross multiply
   12,558x = 21,388.50 × 21,388.50
4. Step 4: Simplify right side
   12,558x = 457,467,932.25
5. Step 5: Solve for x
   x = 457,467,932.25/12,558
6. Step 6: Final answer
   x = 36,428.41