Finding the Third Proportional to 5,618.81 and 7,991.06

Step by Step Solution

1. Step 1: Write the proportion equation
   5,618.81 : 7,991.06 = 7,991.06 : x
2. Step 2: Convert to fraction form
   5,618.81/7,991.06 = 7,991.06/x
3. Step 3: Cross multiply
   5,618.81x = 7,991.06 × 7,991.06
4. Step 4: Simplify right side
   5,618.81x = 63,857,079.88
5. Step 5: Solve for x
   x = 63,857,079.88/5,618.81
6. Step 6: Final answer
   x = 11,364.87