Finding the Fourth Proportional to 1,369.78, 1,892.85 and 1,121.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,369.78 : 1,892.85 = 1,121.01 : x
2. Step 2: Convert to fraction form
   1,369.78/1,892.85 = 1,121.01/x
3. Step 3: Cross multiply
   1,369.78x = 1,892.85 × 1,121.01
4. Step 4: Simplify right side
   1,369.78x = 2,121,903.78
5. Step 5: Solve for x
   x = 2,121,903.78/1,369.78
6. Step 6: Final answer
   x = 1,549.08