Finding the Third Proportional to 1,290.52 and 1,570.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.52 : 1,570.43 = 1,570.43 : x
2. Step 2: Convert to fraction form
   1,290.52/1,570.43 = 1,570.43/x
3. Step 3: Cross multiply
   1,290.52x = 1,570.43 × 1,570.43
4. Step 4: Simplify right side
   1,290.52x = 2,466,249.40
5. Step 5: Solve for x
   x = 2,466,249.40/1,290.52
6. Step 6: Final answer
   x = 1,911.06