Finding the Third Proportional to 39,653 and 57,990

Step by Step Solution

1. Step 1: Write the proportion equation
   39,653 : 57,990 = 57,990 : x
2. Step 2: Convert to fraction form
   39,653/57,990 = 57,990/x
3. Step 3: Cross multiply
   39,653x = 57,990 × 57,990
4. Step 4: Simplify right side
   39,653x = 3,362,840,100
5. Step 5: Solve for x
   x = 3,362,840,100/39,653
6. Step 6: Final answer
   x = 84,806.70