Finding the Fourth Proportional to 1,642.58, 2,266.52 and 979.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,642.58 : 2,266.52 = 979.29 : x
2. Step 2: Convert to fraction form
   1,642.58/2,266.52 = 979.29/x
3. Step 3: Cross multiply
   1,642.58x = 2,266.52 × 979.29
4. Step 4: Simplify right side
   1,642.58x = 2,219,575.47
5. Step 5: Solve for x
   x = 2,219,575.47/1,642.58
6. Step 6: Final answer
   x = 1,351.27