Finding the Fourth Proportional to 1,003.77, 1,505.72 and 570.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.77 : 1,505.72 = 570.09 : x
2. Step 2: Convert to fraction form
   1,003.77/1,505.72 = 570.09/x
3. Step 3: Cross multiply
   1,003.77x = 1,505.72 × 570.09
4. Step 4: Simplify right side
   1,003.77x = 858,393.06
5. Step 5: Solve for x
   x = 858,393.06/1,003.77
6. Step 6: Final answer
   x = 855.17