Finding the Fourth Proportional to 2,334.56, 3,221.73 and 1,390.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,334.56 : 3,221.73 = 1,390.50 : x
2. Step 2: Convert to fraction form
   2,334.56/3,221.73 = 1,390.50/x
3. Step 3: Cross multiply
   2,334.56x = 3,221.73 × 1,390.50
4. Step 4: Simplify right side
   2,334.56x = 4,479,815.57
5. Step 5: Solve for x
   x = 4,479,815.57/2,334.56
6. Step 6: Final answer
   x = 1,918.92