Finding the Fourth Proportional to 1,400.79, 2,098.88 and 851.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,400.79 : 2,098.88 = 851.31 : x
2. Step 2: Convert to fraction form
   1,400.79/2,098.88 = 851.31/x
3. Step 3: Cross multiply
   1,400.79x = 2,098.88 × 851.31
4. Step 4: Simplify right side
   1,400.79x = 1,786,796.47
5. Step 5: Solve for x
   x = 1,786,796.47/1,400.79
6. Step 6: Final answer
   x = 1,275.56