Finding the Fourth Proportional to 1,886.69, 2,830.53 and 570.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,886.69 : 2,830.53 = 570.43 : x
2. Step 2: Convert to fraction form
   1,886.69/2,830.53 = 570.43/x
3. Step 3: Cross multiply
   1,886.69x = 2,830.53 × 570.43
4. Step 4: Simplify right side
   1,886.69x = 1,614,605.77
5. Step 5: Solve for x
   x = 1,614,605.77/1,886.69
6. Step 6: Final answer
   x = 855.79