Finding the Fourth Proportional to 2,103.13, 3,150.78 and 1,407.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.13 : 3,150.78 = 1,407.75 : x
2. Step 2: Convert to fraction form
   2,103.13/3,150.78 = 1,407.75/x
3. Step 3: Cross multiply
   2,103.13x = 3,150.78 × 1,407.75
4. Step 4: Simplify right side
   2,103.13x = 4,435,510.55
5. Step 5: Solve for x
   x = 4,435,510.55/2,103.13
6. Step 6: Final answer
   x = 2,109.00