Finding the Third Proportional to 1,987.31 and 3,924.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,987.31 : 3,924.56 = 3,924.56 : x
2. Step 2: Convert to fraction form
   1,987.31/3,924.56 = 3,924.56/x
3. Step 3: Cross multiply
   1,987.31x = 3,924.56 × 3,924.56
4. Step 4: Simplify right side
   1,987.31x = 15,402,190.82
5. Step 5: Solve for x
   x = 15,402,190.82/1,987.31
6. Step 6: Final answer
   x = 7,750.26