Finding the Fourth Proportional to 1,011.15, 1,395.30 and 569.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,011.15 : 1,395.30 = 569.10 : x
2. Step 2: Convert to fraction form
   1,011.15/1,395.30 = 569.10/x
3. Step 3: Cross multiply
   1,011.15x = 1,395.30 × 569.10
4. Step 4: Simplify right side
   1,011.15x = 794,065.23
5. Step 5: Solve for x
   x = 794,065.23/1,011.15
6. Step 6: Final answer
   x = 785.31