Finding the Third Proportional to 8,921 and 13,875.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,921 : 13,875.50 = 13,875.50 : x
2. Step 2: Convert to fraction form
   8,921/13,875.50 = 13,875.50/x
3. Step 3: Cross multiply
   8,921x = 13,875.50 × 13,875.50
4. Step 4: Simplify right side
   8,921x = 192,529,500.25
5. Step 5: Solve for x
   x = 192,529,500.25/8,921
6. Step 6: Final answer
   x = 21,581.61