Finding the Fourth Proportional to 1,036.76, 1,429.43 and 663.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,036.76 : 1,429.43 = 663.12 : x
2. Step 2: Convert to fraction form
   1,036.76/1,429.43 = 663.12/x
3. Step 3: Cross multiply
   1,036.76x = 1,429.43 × 663.12
4. Step 4: Simplify right side
   1,036.76x = 947,880.31
5. Step 5: Solve for x
   x = 947,880.31/1,036.76
6. Step 6: Final answer
   x = 914.28