Finding the Fourth Proportional to 1,579.31, 2,179.25 and 916.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,579.31 : 2,179.25 = 916.07 : x
2. Step 2: Convert to fraction form
   1,579.31/2,179.25 = 916.07/x
3. Step 3: Cross multiply
   1,579.31x = 2,179.25 × 916.07
4. Step 4: Simplify right side
   1,579.31x = 1,996,345.55
5. Step 5: Solve for x
   x = 1,996,345.55/1,579.31
6. Step 6: Final answer
   x = 1,264.06