Finding the Fourth Proportional to 1,491.36, 2,056.72 and 931.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,491.36 : 2,056.72 = 931.88 : x
2. Step 2: Convert to fraction form
   1,491.36/2,056.72 = 931.88/x
3. Step 3: Cross multiply
   1,491.36x = 2,056.72 × 931.88
4. Step 4: Simplify right side
   1,491.36x = 1,916,616.23
5. Step 5: Solve for x
   x = 1,916,616.23/1,491.36
6. Step 6: Final answer
   x = 1,285.15