Finding the Fourth Proportional to 1,567.21, 2,162.71 and 859.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,567.21 : 2,162.71 = 859.07 : x
2. Step 2: Convert to fraction form
   1,567.21/2,162.71 = 859.07/x
3. Step 3: Cross multiply
   1,567.21x = 2,162.71 × 859.07
4. Step 4: Simplify right side
   1,567.21x = 1,857,908.76
5. Step 5: Solve for x
   x = 1,857,908.76/1,567.21
6. Step 6: Final answer
   x = 1,185.49