Finding the Fourth Proportional to 1,036.56, 1,430.40 and 570.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,036.56 : 1,430.40 = 570.72 : x
2. Step 2: Convert to fraction form
   1,036.56/1,430.40 = 570.72/x
3. Step 3: Cross multiply
   1,036.56x = 1,430.40 × 570.72
4. Step 4: Simplify right side
   1,036.56x = 816,357.89
5. Step 5: Solve for x
   x = 816,357.89/1,036.56
6. Step 6: Final answer
   x = 787.56