Finding the Third Proportional to 5,385.75 and 7,891.50

Step by Step Solution

1. Step 1: Write the proportion equation
   5,385.75 : 7,891.50 = 7,891.50 : x
2. Step 2: Convert to fraction form
   5,385.75/7,891.50 = 7,891.50/x
3. Step 3: Cross multiply
   5,385.75x = 7,891.50 × 7,891.50
4. Step 4: Simplify right side
   5,385.75x = 62,275,772.25
5. Step 5: Solve for x
   x = 62,275,772.25/5,385.75
6. Step 6: Final answer
   x = 11,563.06