Finding the Fourth Proportional to 1,011.95, 1,396.56 and 569.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,011.95 : 1,396.56 = 569.90 : x
2. Step 2: Convert to fraction form
   1,011.95/1,396.56 = 569.90/x
3. Step 3: Cross multiply
   1,011.95x = 1,396.56 × 569.90
4. Step 4: Simplify right side
   1,011.95x = 795,892.56
5. Step 5: Solve for x
   x = 795,892.56/1,011.95
6. Step 6: Final answer
   x = 786.50