Finding the Fourth Proportional to 2,583.21, 3,875.13 and 851.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,583.21 : 3,875.13 = 851.79 : x
2. Step 2: Convert to fraction form
   2,583.21/3,875.13 = 851.79/x
3. Step 3: Cross multiply
   2,583.21x = 3,875.13 × 851.79
4. Step 4: Simplify right side
   2,583.21x = 3,300,796.98
5. Step 5: Solve for x
   x = 3,300,796.98/2,583.21
6. Step 6: Final answer
   x = 1,277.79