Finding the Fourth Proportional to 1,012.10, 1,395.78 and 731.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.10 : 1,395.78 = 731.30 : x
2. Step 2: Convert to fraction form
   1,012.10/1,395.78 = 731.30/x
3. Step 3: Cross multiply
   1,012.10x = 1,395.78 × 731.30
4. Step 4: Simplify right side
   1,012.10x = 1,020,733.91
5. Step 5: Solve for x
   x = 1,020,733.91/1,012.10
6. Step 6: Final answer
   x = 1,008.53