Finding the Fourth Proportional to 1,509.89, 2,083.55 and 920.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,509.89 : 2,083.55 = 920.30 : x
2. Step 2: Convert to fraction form
   1,509.89/2,083.55 = 920.30/x
3. Step 3: Cross multiply
   1,509.89x = 2,083.55 × 920.30
4. Step 4: Simplify right side
   1,509.89x = 1,917,476.05
5. Step 5: Solve for x
   x = 1,917,476.05/1,509.89
6. Step 6: Final answer
   x = 1,269.95