Finding the Fourth Proportional to 1,140.89, 1,710.72 and 491.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,140.89 : 1,710.72 = 491.27 : x
2. Step 2: Convert to fraction form
   1,140.89/1,710.72 = 491.27/x
3. Step 3: Cross multiply
   1,140.89x = 1,710.72 × 491.27
4. Step 4: Simplify right side
   1,140.89x = 840,416.86
5. Step 5: Solve for x
   x = 840,416.86/1,140.89
6. Step 6: Final answer
   x = 736.64