Finding the Fourth Proportional to 2,102.77, 3,152.53 and 1,280.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,102.77 : 3,152.53 = 1,280.89 : x
2. Step 2: Convert to fraction form
   2,102.77/3,152.53 = 1,280.89/x
3. Step 3: Cross multiply
   2,102.77x = 3,152.53 × 1,280.89
4. Step 4: Simplify right side
   2,102.77x = 4,038,044.15
5. Step 5: Solve for x
   x = 4,038,044.15/2,102.77
6. Step 6: Final answer
   x = 1,920.35