Finding the Third Proportional to 39,928.50 and 55,516.50

Step by Step Solution

1. Step 1: Write the proportion equation
   39,928.50 : 55,516.50 = 55,516.50 : x
2. Step 2: Convert to fraction form
   39,928.50/55,516.50 = 55,516.50/x
3. Step 3: Cross multiply
   39,928.50x = 55,516.50 × 55,516.50
4. Step 4: Simplify right side
   39,928.50x = 3,082,081,772.25
5. Step 5: Solve for x
   x = 3,082,081,772.25/39,928.50
6. Step 6: Final answer
   x = 77,190.02