Finding the Third Proportional to 39,899.25 and 84,408.75

Step by Step Solution

1. Step 1: Write the proportion equation
   39,899.25 : 84,408.75 = 84,408.75 : x
2. Step 2: Convert to fraction form
   39,899.25/84,408.75 = 84,408.75/x
3. Step 3: Cross multiply
   39,899.25x = 84,408.75 × 84,408.75
4. Step 4: Simplify right side
   39,899.25x = 7,124,837,076.56
5. Step 5: Solve for x
   x = 7,124,837,076.56/39,899.25
6. Step 6: Final answer
   x = 178,570.70