Finding the Fourth Proportional to 2,073.89, 3,111.71 and 840.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,073.89 : 3,111.71 = 840.98 : x
2. Step 2: Convert to fraction form
   2,073.89/3,111.71 = 840.98/x
3. Step 3: Cross multiply
   2,073.89x = 3,111.71 × 840.98
4. Step 4: Simplify right side
   2,073.89x = 2,616,889.45
5. Step 5: Solve for x
   x = 2,616,889.45/2,073.89
6. Step 6: Final answer
   x = 1,261.83