Finding the Third Proportional to 28,728 and 42,140

Step by Step Solution

1. Step 1: Write the proportion equation
   28,728 : 42,140 = 42,140 : x
2. Step 2: Convert to fraction form
   28,728/42,140 = 42,140/x
3. Step 3: Cross multiply
   28,728x = 42,140 × 42,140
4. Step 4: Simplify right side
   28,728x = 1,775,779,600
5. Step 5: Solve for x
   x = 1,775,779,600/28,728
6. Step 6: Final answer
   x = 61,813.55