Finding the Fourth Proportional to 3,118.78, 4,303.89 and 1,721.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,118.78 : 4,303.89 = 1,721.50 : x
2. Step 2: Convert to fraction form
   3,118.78/4,303.89 = 1,721.50/x
3. Step 3: Cross multiply
   3,118.78x = 4,303.89 × 1,721.50
4. Step 4: Simplify right side
   3,118.78x = 7,409,146.64
5. Step 5: Solve for x
   x = 7,409,146.64/3,118.78
6. Step 6: Final answer
   x = 2,375.66