Finding the Fourth Proportional to 1,511.18, 2,085.29 and 921.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,511.18 : 2,085.29 = 921.59 : x
2. Step 2: Convert to fraction form
   1,511.18/2,085.29 = 921.59/x
3. Step 3: Cross multiply
   1,511.18x = 2,085.29 × 921.59
4. Step 4: Simplify right side
   1,511.18x = 1,921,783.02
5. Step 5: Solve for x
   x = 1,921,783.02/1,511.18
6. Step 6: Final answer
   x = 1,271.71