Finding the Fourth Proportional to 1,047.69, 1,445.80 and 569.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.69 : 1,445.80 = 569.15 : x
2. Step 2: Convert to fraction form
   1,047.69/1,445.80 = 569.15/x
3. Step 3: Cross multiply
   1,047.69x = 1,445.80 × 569.15
4. Step 4: Simplify right side
   1,047.69x = 822,884.64
5. Step 5: Solve for x
   x = 822,884.64/1,047.69
6. Step 6: Final answer
   x = 785.43