Finding the Third Proportional to 28,458 and 42,778.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,458 : 42,778.50 = 42,778.50 : x
2. Step 2: Convert to fraction form
   28,458/42,778.50 = 42,778.50/x
3. Step 3: Cross multiply
   28,458x = 42,778.50 × 42,778.50
4. Step 4: Simplify right side
   28,458x = 1,830,000,062.25
5. Step 5: Solve for x
   x = 1,830,000,062.25/28,458
6. Step 6: Final answer
   x = 64,305.29