Finding the Fourth Proportional to 1,012.17, 1,396.82 and 662.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.17 : 1,396.82 = 662.87 : x
2. Step 2: Convert to fraction form
   1,012.17/1,396.82 = 662.87/x
3. Step 3: Cross multiply
   1,012.17x = 1,396.82 × 662.87
4. Step 4: Simplify right side
   1,012.17x = 925,899.77
5. Step 5: Solve for x
   x = 925,899.77/1,012.17
6. Step 6: Final answer
   x = 914.77