Finding the Fourth Proportional to 1,490.79, 2,057.56 and 931.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,490.79 : 2,057.56 = 931.62 : x
2. Step 2: Convert to fraction form
   1,490.79/2,057.56 = 931.62/x
3. Step 3: Cross multiply
   1,490.79x = 2,057.56 × 931.62
4. Step 4: Simplify right side
   1,490.79x = 1,916,869.43
5. Step 5: Solve for x
   x = 1,916,869.43/1,490.79
6. Step 6: Final answer
   x = 1,285.80