Finding the Third Proportional to 905.06 and 1,978.31

Step by Step Solution

1. Step 1: Write the proportion equation
   905.06 : 1,978.31 = 1,978.31 : x
2. Step 2: Convert to fraction form
   905.06/1,978.31 = 1,978.31/x
3. Step 3: Cross multiply
   905.06x = 1,978.31 × 1,978.31
4. Step 4: Simplify right side
   905.06x = 3,913,720.35
5. Step 5: Solve for x
   x = 3,913,720.35/905.06
6. Step 6: Final answer
   x = 4,324.25