Finding the Fourth Proportional to 3,572.89, 4,929.78 and 2,156.81

Step by Step Solution

1. Step 1: Write the proportion equation
   3,572.89 : 4,929.78 = 2,156.81 : x
2. Step 2: Convert to fraction form
   3,572.89/4,929.78 = 2,156.81/x
3. Step 3: Cross multiply
   3,572.89x = 4,929.78 × 2,156.81
4. Step 4: Simplify right side
   3,572.89x = 10,632,574.15
5. Step 5: Solve for x
   x = 10,632,574.15/3,572.89
6. Step 6: Final answer
   x = 2,975.91