Finding the Third Proportional to 39,428.56 and 86,490.56

Step by Step Solution

1. Step 1: Write the proportion equation
   39,428.56 : 86,490.56 = 86,490.56 : x
2. Step 2: Convert to fraction form
   39,428.56/86,490.56 = 86,490.56/x
3. Step 3: Cross multiply
   39,428.56x = 86,490.56 × 86,490.56
4. Step 4: Simplify right side
   39,428.56x = 7,480,617,401.57
5. Step 5: Solve for x
   x = 7,480,617,401.57/39,428.56
6. Step 6: Final answer
   x = 189,725.85