Finding the Fourth Proportional to 1,583.48, 2,185.47 and 920.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,583.48 : 2,185.47 = 920.72 : x
2. Step 2: Convert to fraction form
   1,583.48/2,185.47 = 920.72/x
3. Step 3: Cross multiply
   1,583.48x = 2,185.47 × 920.72
4. Step 4: Simplify right side
   1,583.48x = 2,012,199.11
5. Step 5: Solve for x
   x = 2,012,199.11/1,583.48
6. Step 6: Final answer
   x = 1,270.75