Finding the Fourth Proportional to 1,916.01, 2,644.52 and 1,217.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,916.01 : 2,644.52 = 1,217.25 : x
2. Step 2: Convert to fraction form
   1,916.01/2,644.52 = 1,217.25/x
3. Step 3: Cross multiply
   1,916.01x = 2,644.52 × 1,217.25
4. Step 4: Simplify right side
   1,916.01x = 3,219,035.88
5. Step 5: Solve for x
   x = 3,219,035.88/1,916.01
6. Step 6: Final answer
   x = 1,680.07