Finding the Fourth Proportional to 1,868.80, 2,796.96 and 1,405.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,868.80 : 2,796.96 = 1,405.45 : x
2. Step 2: Convert to fraction form
   1,868.80/2,796.96 = 1,405.45/x
3. Step 3: Cross multiply
   1,868.80x = 2,796.96 × 1,405.45
4. Step 4: Simplify right side
   1,868.80x = 3,930,987.43
5. Step 5: Solve for x
   x = 3,930,987.43/1,868.80
6. Step 6: Final answer
   x = 2,103.48