Finding the Fourth Proportional to 2,290.17, 3,160.35 and 1,242.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,290.17 : 3,160.35 = 1,242.21 : x
2. Step 2: Convert to fraction form
   2,290.17/3,160.35 = 1,242.21/x
3. Step 3: Cross multiply
   2,290.17x = 3,160.35 × 1,242.21
4. Step 4: Simplify right side
   2,290.17x = 3,925,818.37
5. Step 5: Solve for x
   x = 3,925,818.37/2,290.17
6. Step 6: Final answer
   x = 1,714.20