Finding the Fourth Proportional to 1,051.29, 1,578.29 and 743.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,051.29 : 1,578.29 = 743.31 : x
2. Step 2: Convert to fraction form
   1,051.29/1,578.29 = 743.31/x
3. Step 3: Cross multiply
   1,051.29x = 1,578.29 × 743.31
4. Step 4: Simplify right side
   1,051.29x = 1,173,155.02
5. Step 5: Solve for x
   x = 1,173,155.02/1,051.29
6. Step 6: Final answer
   x = 1,115.92