Finding the Fourth Proportional to 1,490.42, 2,057.76 and 931.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,490.42 : 2,057.76 = 931.10 : x
2. Step 2: Convert to fraction form
   1,490.42/2,057.76 = 931.10/x
3. Step 3: Cross multiply
   1,490.42x = 2,057.76 × 931.10
4. Step 4: Simplify right side
   1,490.42x = 1,915,980.34
5. Step 5: Solve for x
   x = 1,915,980.34/1,490.42
6. Step 6: Final answer
   x = 1,285.53