Finding the Fourth Proportional to 1,549.89, 2,139.14 and 920.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,549.89 : 2,139.14 = 920.39 : x
2. Step 2: Convert to fraction form
   1,549.89/2,139.14 = 920.39/x
3. Step 3: Cross multiply
   1,549.89x = 2,139.14 × 920.39
4. Step 4: Simplify right side
   1,549.89x = 1,968,834.67
5. Step 5: Solve for x
   x = 1,968,834.67/1,549.89
6. Step 6: Final answer
   x = 1,270.31