Finding the Fourth Proportional to 1,012.82, 1,397.32 and 663.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.82 : 1,397.32 = 663.98 : x
2. Step 2: Convert to fraction form
   1,012.82/1,397.32 = 663.98/x
3. Step 3: Cross multiply
   1,012.82x = 1,397.32 × 663.98
4. Step 4: Simplify right side
   1,012.82x = 927,783.89
5. Step 5: Solve for x
   x = 927,783.89/1,012.82
6. Step 6: Final answer
   x = 916.04