Finding the Third Proportional to 28,720.50 and 42,907.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,720.50 : 42,907.50 = 42,907.50 : x
2. Step 2: Convert to fraction form
   28,720.50/42,907.50 = 42,907.50/x
3. Step 3: Cross multiply
   28,720.50x = 42,907.50 × 42,907.50
4. Step 4: Simplify right side
   28,720.50x = 1,841,053,556.25
5. Step 5: Solve for x
   x = 1,841,053,556.25/28,720.50
6. Step 6: Final answer
   x = 64,102.42