Finding the Fourth Proportional to 2,921.51, 4,384.18 and 1,072.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,921.51 : 4,384.18 = 1,072.64 : x
2. Step 2: Convert to fraction form
   2,921.51/4,384.18 = 1,072.64/x
3. Step 3: Cross multiply
   2,921.51x = 4,384.18 × 1,072.64
4. Step 4: Simplify right side
   2,921.51x = 4,702,662.15
5. Step 5: Solve for x
   x = 4,702,662.15/2,921.51
6. Step 6: Final answer
   x = 1,609.67