Finding the Fourth Proportional to 2,090.56, 2,883.72 and 1,392.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,090.56 : 2,883.72 = 1,392.88 : x
2. Step 2: Convert to fraction form
   2,090.56/2,883.72 = 1,392.88/x
3. Step 3: Cross multiply
   2,090.56x = 2,883.72 × 1,392.88
4. Step 4: Simplify right side
   2,090.56x = 4,016,675.91
5. Step 5: Solve for x
   x = 4,016,675.91/2,090.56
6. Step 6: Final answer
   x = 1,921.34