Finding the Fourth Proportional to 1,034.90, 1,428.15 and 569.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,034.90 : 1,428.15 = 569.15 : x
2. Step 2: Convert to fraction form
   1,034.90/1,428.15 = 569.15/x
3. Step 3: Cross multiply
   1,034.90x = 1,428.15 × 569.15
4. Step 4: Simplify right side
   1,034.90x = 812,824.43
5. Step 5: Solve for x
   x = 812,824.43/1,034.90
6. Step 6: Final answer
   x = 785.42