Finding the Fourth Proportional to 2,700.21, 4,050.86 and 851.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,700.21 : 4,050.86 = 851.50 : x
2. Step 2: Convert to fraction form
   2,700.21/4,050.86 = 851.50/x
3. Step 3: Cross multiply
   2,700.21x = 4,050.86 × 851.50
4. Step 4: Simplify right side
   2,700.21x = 3,449,292.91
5. Step 5: Solve for x
   x = 3,449,292.91/2,700.21
6. Step 6: Final answer
   x = 1,277.42