Finding the Fourth Proportional to 1,648.35, 2,470.37 and 1,261.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,648.35 : 2,470.37 = 1,261.71 : x
2. Step 2: Convert to fraction form
   1,648.35/2,470.37 = 1,261.71/x
3. Step 3: Cross multiply
   1,648.35x = 2,470.37 × 1,261.71
4. Step 4: Simplify right side
   1,648.35x = 3,116,884.22
5. Step 5: Solve for x
   x = 3,116,884.22/1,648.35
6. Step 6: Final answer
   x = 1,890.91