Finding the Third Proportional to 989.63 and 1,426.31

Step by Step Solution

1. Step 1: Write the proportion equation
   989.63 : 1,426.31 = 1,426.31 : x
2. Step 2: Convert to fraction form
   989.63/1,426.31 = 1,426.31/x
3. Step 3: Cross multiply
   989.63x = 1,426.31 × 1,426.31
4. Step 4: Simplify right side
   989.63x = 2,034,367.35
5. Step 5: Solve for x
   x = 2,034,367.35/989.63
6. Step 6: Final answer
   x = 2,055.70