Finding the Fourth Proportional to 1,900.21, 2,851.82 and 860.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,900.21 : 2,851.82 = 860.29 : x
2. Step 2: Convert to fraction form
   1,900.21/2,851.82 = 860.29/x
3. Step 3: Cross multiply
   1,900.21x = 2,851.82 × 860.29
4. Step 4: Simplify right side
   1,900.21x = 2,453,388.86
5. Step 5: Solve for x
   x = 2,453,388.86/1,900.21
6. Step 6: Final answer
   x = 1,291.12