Finding the Fourth Proportional to 1,245.14, 1,868.50 and 1,128.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,245.14 : 1,868.50 = 1,128.25 : x
2. Step 2: Convert to fraction form
   1,245.14/1,868.50 = 1,128.25/x
3. Step 3: Cross multiply
   1,245.14x = 1,868.50 × 1,128.25
4. Step 4: Simplify right side
   1,245.14x = 2,108,128.58
5. Step 5: Solve for x
   x = 2,108,128.58/1,245.14
6. Step 6: Final answer
   x = 1,693.08