Finding the Fourth Proportional to 2,290.31, 3,160.59 and 1,393.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,290.31 : 3,160.59 = 1,393.75 : x
2. Step 2: Convert to fraction form
   2,290.31/3,160.59 = 1,393.75/x
3. Step 3: Cross multiply
   2,290.31x = 3,160.59 × 1,393.75
4. Step 4: Simplify right side
   2,290.31x = 4,405,056.51
5. Step 5: Solve for x
   x = 4,405,056.51/2,290.31
6. Step 6: Final answer
   x = 1,923.35