Finding the Third Proportional to 42,779.25 and 65,839.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,779.25 : 65,839.50 = 65,839.50 : x
2. Step 2: Convert to fraction form
   42,779.25/65,839.50 = 65,839.50/x
3. Step 3: Cross multiply
   42,779.25x = 65,839.50 × 65,839.50
4. Step 4: Simplify right side
   42,779.25x = 4,334,839,760.25
5. Step 5: Solve for x
   x = 4,334,839,760.25/42,779.25
6. Step 6: Final answer
   x = 101,330.43