Finding the Fourth Proportional to 1,009.98, 1,393.47 and 616.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009.98 : 1,393.47 = 616.59 : x
2. Step 2: Convert to fraction form
   1,009.98/1,393.47 = 616.59/x
3. Step 3: Cross multiply
   1,009.98x = 1,393.47 × 616.59
4. Step 4: Simplify right side
   1,009.98x = 859,199.67
5. Step 5: Solve for x
   x = 859,199.67/1,009.98
6. Step 6: Final answer
   x = 850.71