Finding the Third Proportional to 21,407 and 28,404.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,407 : 28,404.50 = 28,404.50 : x
2. Step 2: Convert to fraction form
   21,407/28,404.50 = 28,404.50/x
3. Step 3: Cross multiply
   21,407x = 28,404.50 × 28,404.50
4. Step 4: Simplify right side
   21,407x = 806,815,620.25
5. Step 5: Solve for x
   x = 806,815,620.25/21,407
6. Step 6: Final answer
   x = 37,689.34