Finding the Fourth Proportional to 1,511.59, 2,085.72 and 922.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,511.59 : 2,085.72 = 922.31 : x
2. Step 2: Convert to fraction form
   1,511.59/2,085.72 = 922.31/x
3. Step 3: Cross multiply
   1,511.59x = 2,085.72 × 922.31
4. Step 4: Simplify right side
   1,511.59x = 1,923,680.41
5. Step 5: Solve for x
   x = 1,923,680.41/1,511.59
6. Step 6: Final answer
   x = 1,272.62