Finding the Third Proportional to 5,470.88 and 7,990.31

Step by Step Solution

1. Step 1: Write the proportion equation
   5,470.88 : 7,990.31 = 7,990.31 : x
2. Step 2: Convert to fraction form
   5,470.88/7,990.31 = 7,990.31/x
3. Step 3: Cross multiply
   5,470.88x = 7,990.31 × 7,990.31
4. Step 4: Simplify right side
   5,470.88x = 63,845,093.85
5. Step 5: Solve for x
   x = 63,845,093.85/5,470.88
6. Step 6: Final answer
   x = 11,670.00