Finding the Third Proportional to 36,139.50 and 42,619.50

Step by Step Solution

1. Step 1: Write the proportion equation
   36,139.50 : 42,619.50 = 42,619.50 : x
2. Step 2: Convert to fraction form
   36,139.50/42,619.50 = 42,619.50/x
3. Step 3: Cross multiply
   36,139.50x = 42,619.50 × 42,619.50
4. Step 4: Simplify right side
   36,139.50x = 1,816,421,780.25
5. Step 5: Solve for x
   x = 1,816,421,780.25/36,139.50
6. Step 6: Final answer
   x = 50,261.40