Finding the Fourth Proportional to 1,900.24, 2,621.20 and 1,200.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,900.24 : 2,621.20 = 1,200.40 : x
2. Step 2: Convert to fraction form
   1,900.24/2,621.20 = 1,200.40/x
3. Step 3: Cross multiply
   1,900.24x = 2,621.20 × 1,200.40
4. Step 4: Simplify right side
   1,900.24x = 3,146,488.48
5. Step 5: Solve for x
   x = 3,146,488.48/1,900.24
6. Step 6: Final answer
   x = 1,655.84