Finding the Fourth Proportional to 1,351.52, 1,863.12 and 931.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,351.52 : 1,863.12 = 931.20 : x
2. Step 2: Convert to fraction form
   1,351.52/1,863.12 = 931.20/x
3. Step 3: Cross multiply
   1,351.52x = 1,863.12 × 931.20
4. Step 4: Simplify right side
   1,351.52x = 1,734,937.34
5. Step 5: Solve for x
   x = 1,734,937.34/1,351.52
6. Step 6: Final answer
   x = 1,283.69