Finding the Fourth Proportional to 2,921.55, 4,380.82 and 1,072.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,921.55 : 4,380.82 = 1,072.18 : x
2. Step 2: Convert to fraction form
   2,921.55/4,380.82 = 1,072.18/x
3. Step 3: Cross multiply
   2,921.55x = 4,380.82 × 1,072.18
4. Step 4: Simplify right side
   2,921.55x = 4,697,027.59
5. Step 5: Solve for x
   x = 4,697,027.59/2,921.55
6. Step 6: Final answer
   x = 1,607.72