Finding the Fourth Proportional to 1,011.40, 1,395.72 and 569.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,011.40 : 1,395.72 = 569.30 : x
2. Step 2: Convert to fraction form
   1,011.40/1,395.72 = 569.30/x
3. Step 3: Cross multiply
   1,011.40x = 1,395.72 × 569.30
4. Step 4: Simplify right side
   1,011.40x = 794,576.42
5. Step 5: Solve for x
   x = 794,576.42/1,011.40
6. Step 6: Final answer
   x = 785.62