Finding the Fourth Proportional to 1,491.96, 2,057.61 and 931.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,491.96 : 2,057.61 = 931.86 : x
2. Step 2: Convert to fraction form
   1,491.96/2,057.61 = 931.86/x
3. Step 3: Cross multiply
   1,491.96x = 2,057.61 × 931.86
4. Step 4: Simplify right side
   1,491.96x = 1,917,404.45
5. Step 5: Solve for x
   x = 1,917,404.45/1,491.96
6. Step 6: Final answer
   x = 1,285.16