Finding the Fourth Proportional to 1,393.72, 2,090.56 and 571.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.72 : 2,090.56 = 571.76 : x
2. Step 2: Convert to fraction form
   1,393.72/2,090.56 = 571.76/x
3. Step 3: Cross multiply
   1,393.72x = 2,090.56 × 571.76
4. Step 4: Simplify right side
   1,393.72x = 1,195,298.59
5. Step 5: Solve for x
   x = 1,195,298.59/1,393.72
6. Step 6: Final answer
   x = 857.63