Finding the Third Proportional to 978.75 and 1,555.31

Step by Step Solution

1. Step 1: Write the proportion equation
   978.75 : 1,555.31 = 1,555.31 : x
2. Step 2: Convert to fraction form
   978.75/1,555.31 = 1,555.31/x
3. Step 3: Cross multiply
   978.75x = 1,555.31 × 1,555.31
4. Step 4: Simplify right side
   978.75x = 2,418,996.97
5. Step 5: Solve for x
   x = 2,418,996.97/978.75
6. Step 6: Final answer
   x = 2,471.52