Finding the Fourth Proportional to 1,859.81, 2,566.59 and 1,020.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,859.81 : 2,566.59 = 1,020.47 : x
2. Step 2: Convert to fraction form
   1,859.81/2,566.59 = 1,020.47/x
3. Step 3: Cross multiply
   1,859.81x = 2,566.59 × 1,020.47
4. Step 4: Simplify right side
   1,859.81x = 2,619,111.44
5. Step 5: Solve for x
   x = 2,619,111.44/1,859.81
6. Step 6: Final answer
   x = 1,408.27