Finding the Fourth Proportional to 1,006.98, 1,389.58 and 587.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,006.98 : 1,389.58 = 587.34 : x
2. Step 2: Convert to fraction form
   1,006.98/1,389.58 = 587.34/x
3. Step 3: Cross multiply
   1,006.98x = 1,389.58 × 587.34
4. Step 4: Simplify right side
   1,006.98x = 816,155.92
5. Step 5: Solve for x
   x = 816,155.92/1,006.98
6. Step 6: Final answer
   x = 810.50