Finding the Fourth Proportional to 1,019.31, 1,406.61 and 571.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.31 : 1,406.61 = 571.16 : x
2. Step 2: Convert to fraction form
   1,019.31/1,406.61 = 571.16/x
3. Step 3: Cross multiply
   1,019.31x = 1,406.61 × 571.16
4. Step 4: Simplify right side
   1,019.31x = 803,392.33
5. Step 5: Solve for x
   x = 803,392.33/1,019.31
6. Step 6: Final answer
   x = 788.17