Finding the Fourth Proportional to 1,353.31, 1,868.12 and 912.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,353.31 : 1,868.12 = 912.49 : x
2. Step 2: Convert to fraction form
   1,353.31/1,868.12 = 912.49/x
3. Step 3: Cross multiply
   1,353.31x = 1,868.12 × 912.49
4. Step 4: Simplify right side
   1,353.31x = 1,704,640.82
5. Step 5: Solve for x
   x = 1,704,640.82/1,353.31
6. Step 6: Final answer
   x = 1,259.61