Finding the Fourth Proportional to 1,036.70, 1,430.42 and 663.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,036.70 : 1,430.42 = 663.54 : x
2. Step 2: Convert to fraction form
   1,036.70/1,430.42 = 663.54/x
3. Step 3: Cross multiply
   1,036.70x = 1,430.42 × 663.54
4. Step 4: Simplify right side
   1,036.70x = 949,140.89
5. Step 5: Solve for x
   x = 949,140.89/1,036.70
6. Step 6: Final answer
   x = 915.54