Finding the Fourth Proportional to 3,131.06, 4,687.39 and 1,646.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,131.06 : 4,687.39 = 1,646.78 : x
2. Step 2: Convert to fraction form
   3,131.06/4,687.39 = 1,646.78/x
3. Step 3: Cross multiply
   3,131.06x = 4,687.39 × 1,646.78
4. Step 4: Simplify right side
   3,131.06x = 7,719,109.72
5. Step 5: Solve for x
   x = 7,719,109.72/3,131.06
6. Step 6: Final answer
   x = 2,465.34