Finding the Fourth Proportional to 1,311.55, 1,809.89 and 751.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,311.55 : 1,809.89 = 751.62 : x
2. Step 2: Convert to fraction form
   1,311.55/1,809.89 = 751.62/x
3. Step 3: Cross multiply
   1,311.55x = 1,809.89 × 751.62
4. Step 4: Simplify right side
   1,311.55x = 1,360,345.76
5. Step 5: Solve for x
   x = 1,360,345.76/1,311.55
6. Step 6: Final answer
   x = 1,037.20