Finding the Third Proportional to 1,388.25 and 2,931.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.25 : 2,931.50 = 2,931.50 : x
2. Step 2: Convert to fraction form
   1,388.25/2,931.50 = 2,931.50/x
3. Step 3: Cross multiply
   1,388.25x = 2,931.50 × 2,931.50
4. Step 4: Simplify right side
   1,388.25x = 8,593,692.25
5. Step 5: Solve for x
   x = 8,593,692.25/1,388.25
6. Step 6: Final answer
   x = 6,190.31