Finding the Fourth Proportional to 1,400.86, 2,099.94 and 1,280.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,400.86 : 2,099.94 = 1,280.58 : x
2. Step 2: Convert to fraction form
   1,400.86/2,099.94 = 1,280.58/x
3. Step 3: Cross multiply
   1,400.86x = 2,099.94 × 1,280.58
4. Step 4: Simplify right side
   1,400.86x = 2,689,141.17
5. Step 5: Solve for x
   x = 2,689,141.17/1,400.86
6. Step 6: Final answer
   x = 1,919.64