Finding the Fourth Proportional to 1,031.31, 1,423.28 and 565.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,031.31 : 1,423.28 = 565.56 : x
2. Step 2: Convert to fraction form
   1,031.31/1,423.28 = 565.56/x
3. Step 3: Cross multiply
   1,031.31x = 1,423.28 × 565.56
4. Step 4: Simplify right side
   1,031.31x = 804,953.80
5. Step 5: Solve for x
   x = 804,953.80/1,031.31
6. Step 6: Final answer
   x = 780.51