Finding the Fourth Proportional to 1,298.81, 1,793.72 and 1,121.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,298.81 : 1,793.72 = 1,121.42 : x
2. Step 2: Convert to fraction form
   1,298.81/1,793.72 = 1,121.42/x
3. Step 3: Cross multiply
   1,298.81x = 1,793.72 × 1,121.42
4. Step 4: Simplify right side
   1,298.81x = 2,011,513.48
5. Step 5: Solve for x
   x = 2,011,513.48/1,298.81
6. Step 6: Final answer
   x = 1,548.74