Finding the Fourth Proportional to 1,035.90, 1,429.53 and 570.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,035.90 : 1,429.53 = 570.15 : x
2. Step 2: Convert to fraction form
   1,035.90/1,429.53 = 570.15/x
3. Step 3: Cross multiply
   1,035.90x = 1,429.53 × 570.15
4. Step 4: Simplify right side
   1,035.90x = 815,046.53
5. Step 5: Solve for x
   x = 815,046.53/1,035.90
6. Step 6: Final answer
   x = 786.80