Finding the Fourth Proportional to 2,931.57, 4,394.28 and 1,081.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,931.57 : 4,394.28 = 1,081.51 : x
2. Step 2: Convert to fraction form
   2,931.57/4,394.28 = 1,081.51/x
3. Step 3: Cross multiply
   2,931.57x = 4,394.28 × 1,081.51
4. Step 4: Simplify right side
   2,931.57x = 4,752,457.76
5. Step 5: Solve for x
   x = 4,752,457.76/2,931.57
6. Step 6: Final answer
   x = 1,621.13