Finding the Fourth Proportional to 2,485.51, 3,725.94 and 840.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,485.51 : 3,725.94 = 840.91 : x
2. Step 2: Convert to fraction form
   2,485.51/3,725.94 = 840.91/x
3. Step 3: Cross multiply
   2,485.51x = 3,725.94 × 840.91
4. Step 4: Simplify right side
   2,485.51x = 3,133,170.89
5. Step 5: Solve for x
   x = 3,133,170.89/2,485.51
6. Step 6: Final answer
   x = 1,260.58