Finding the Third Proportional to 42,619.50 and 57,700.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,619.50 : 57,700.50 = 57,700.50 : x
2. Step 2: Convert to fraction form
   42,619.50/57,700.50 = 57,700.50/x
3. Step 3: Cross multiply
   42,619.50x = 57,700.50 × 57,700.50
4. Step 4: Simplify right side
   42,619.50x = 3,329,347,700.25
5. Step 5: Solve for x
   x = 3,329,347,700.25/42,619.50
6. Step 6: Final answer
   x = 78,117.94