Finding the Fourth Proportional to 1,261.89, 1,741.05 and 842.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,261.89 : 1,741.05 = 842.31 : x
2. Step 2: Convert to fraction form
   1,261.89/1,741.05 = 842.31/x
3. Step 3: Cross multiply
   1,261.89x = 1,741.05 × 842.31
4. Step 4: Simplify right side
   1,261.89x = 1,466,503.83
5. Step 5: Solve for x
   x = 1,466,503.83/1,261.89
6. Step 6: Final answer
   x = 1,162.15