Finding the Fourth Proportional to 1,288.15, 1,931.92 and 740.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.15 : 1,931.92 = 740.05 : x
2. Step 2: Convert to fraction form
   1,288.15/1,931.92 = 740.05/x
3. Step 3: Cross multiply
   1,288.15x = 1,931.92 × 740.05
4. Step 4: Simplify right side
   1,288.15x = 1,429,717.40
5. Step 5: Solve for x
   x = 1,429,717.40/1,288.15
6. Step 6: Final answer
   x = 1,109.90