Finding the Third Proportional to 39,990.38 and 87,513.75

Step by Step Solution

1. Step 1: Write the proportion equation
   39,990.38 : 87,513.75 = 87,513.75 : x
2. Step 2: Convert to fraction form
   39,990.38/87,513.75 = 87,513.75/x
3. Step 3: Cross multiply
   39,990.38x = 87,513.75 × 87,513.75
4. Step 4: Simplify right side
   39,990.38x = 7,658,656,439.06
5. Step 5: Solve for x
   x = 7,658,656,439.06/39,990.38
6. Step 6: Final answer
   x = 191,512.49