Finding the Fourth Proportional to 1,393.10, 1,920.54 and 1,052.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.10 : 1,920.54 = 1,052.18 : x
2. Step 2: Convert to fraction form
   1,393.10/1,920.54 = 1,052.18/x
3. Step 3: Cross multiply
   1,393.10x = 1,920.54 × 1,052.18
4. Step 4: Simplify right side
   1,393.10x = 2,020,753.78
5. Step 5: Solve for x
   x = 2,020,753.78/1,393.10
6. Step 6: Final answer
   x = 1,450.54