Finding the Fourth Proportional to 1,009.58, 1,511.73 and 661.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009.58 : 1,511.73 = 661.82 : x
2. Step 2: Convert to fraction form
   1,009.58/1,511.73 = 661.82/x
3. Step 3: Cross multiply
   1,009.58x = 1,511.73 × 661.82
4. Step 4: Simplify right side
   1,009.58x = 1,000,493.15
5. Step 5: Solve for x
   x = 1,000,493.15/1,009.58
6. Step 6: Final answer
   x = 991.00