Finding the Fourth Proportional to 2,072.06, 3,105.93 and 840.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.06 : 3,105.93 = 840.32 : x
2. Step 2: Convert to fraction form
   2,072.06/3,105.93 = 840.32/x
3. Step 3: Cross multiply
   2,072.06x = 3,105.93 × 840.32
4. Step 4: Simplify right side
   2,072.06x = 2,609,975.10
5. Step 5: Solve for x
   x = 2,609,975.10/2,072.06
6. Step 6: Final answer
   x = 1,259.60