Finding the Fourth Proportional to 1,139.60, 1,708.52 and 619.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.60 : 1,708.52 = 619.27 : x
2. Step 2: Convert to fraction form
   1,139.60/1,708.52 = 619.27/x
3. Step 3: Cross multiply
   1,139.60x = 1,708.52 × 619.27
4. Step 4: Simplify right side
   1,139.60x = 1,058,027.81
5. Step 5: Solve for x
   x = 1,058,027.81/1,139.60
6. Step 6: Final answer
   x = 928.42