Finding the Fourth Proportional to 1,085.43, 1,634.91 and 1,009.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.43 : 1,634.91 = 1,009.40 : x
2. Step 2: Convert to fraction form
   1,085.43/1,634.91 = 1,009.40/x
3. Step 3: Cross multiply
   1,085.43x = 1,634.91 × 1,009.40
4. Step 4: Simplify right side
   1,085.43x = 1,650,271.87
5. Step 5: Solve for x
   x = 1,650,271.87/1,085.43
6. Step 6: Final answer
   x = 1,520.38