Finding the Fourth Proportional to 1,012.01, 1,397.25 and 663.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.01 : 1,397.25 = 663.30 : x
2. Step 2: Convert to fraction form
   1,012.01/1,397.25 = 663.30/x
3. Step 3: Cross multiply
   1,012.01x = 1,397.25 × 663.30
4. Step 4: Simplify right side
   1,012.01x = 926,795.93
5. Step 5: Solve for x
   x = 926,795.93/1,012.01
6. Step 6: Final answer
   x = 915.80