Finding the Fourth Proportional to 1,355.72, 1,869.10 and 935.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.72 : 1,869.10 = 935.32 : x
2. Step 2: Convert to fraction form
   1,355.72/1,869.10 = 935.32/x
3. Step 3: Cross multiply
   1,355.72x = 1,869.10 × 935.32
4. Step 4: Simplify right side
   1,355.72x = 1,748,206.61
5. Step 5: Solve for x
   x = 1,748,206.61/1,355.72
6. Step 6: Final answer
   x = 1,289.50