Finding the Fourth Proportional to 1,059.31, 1,586.33 and 619.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,059.31 : 1,586.33 = 619.40 : x
2. Step 2: Convert to fraction form
   1,059.31/1,586.33 = 619.40/x
3. Step 3: Cross multiply
   1,059.31x = 1,586.33 × 619.40
4. Step 4: Simplify right side
   1,059.31x = 982,570.55
5. Step 5: Solve for x
   x = 982,570.55/1,059.31
6. Step 6: Final answer
   x = 927.56