Finding the Fourth Proportional to 1,004.77, 1,386.82 and 611.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,004.77 : 1,386.82 = 611.72 : x
2. Step 2: Convert to fraction form
   1,004.77/1,386.82 = 611.72/x
3. Step 3: Cross multiply
   1,004.77x = 1,386.82 × 611.72
4. Step 4: Simplify right side
   1,004.77x = 848,344.56
5. Step 5: Solve for x
   x = 848,344.56/1,004.77
6. Step 6: Final answer
   x = 844.32