Finding the Fourth Proportional to 3,100.78, 4,279.06 and 1,684.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,100.78 : 4,279.06 = 1,684.50 : x
2. Step 2: Convert to fraction form
   3,100.78/4,279.06 = 1,684.50/x
3. Step 3: Cross multiply
   3,100.78x = 4,279.06 × 1,684.50
4. Step 4: Simplify right side
   3,100.78x = 7,208,076.57
5. Step 5: Solve for x
   x = 7,208,076.57/3,100.78
6. Step 6: Final answer
   x = 2,324.60