Finding the Fourth Proportional to 1,390.56, 2,085.78 and 568.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.56 : 2,085.78 = 568.62 : x
2. Step 2: Convert to fraction form
   1,390.56/2,085.78 = 568.62/x
3. Step 3: Cross multiply
   1,390.56x = 2,085.78 × 568.62
4. Step 4: Simplify right side
   1,390.56x = 1,186,016.22
5. Step 5: Solve for x
   x = 1,186,016.22/1,390.56
6. Step 6: Final answer
   x = 852.91