Finding the Fourth Proportional to 1,139.98, 1,573.17 and 616.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.98 : 1,573.17 = 616.01 : x
2. Step 2: Convert to fraction form
   1,139.98/1,573.17 = 616.01/x
3. Step 3: Cross multiply
   1,139.98x = 1,573.17 × 616.01
4. Step 4: Simplify right side
   1,139.98x = 969,077.51
5. Step 5: Solve for x
   x = 969,077.51/1,139.98
6. Step 6: Final answer
   x = 850.09