Finding the Third Proportional to 30,699.50 and 45,859.50

Step by Step Solution

1. Step 1: Write the proportion equation
   30,699.50 : 45,859.50 = 45,859.50 : x
2. Step 2: Convert to fraction form
   30,699.50/45,859.50 = 45,859.50/x
3. Step 3: Cross multiply
   30,699.50x = 45,859.50 × 45,859.50
4. Step 4: Simplify right side
   30,699.50x = 2,103,093,740.25
5. Step 5: Solve for x
   x = 2,103,093,740.25/30,699.50
6. Step 6: Final answer
   x = 68,505.80