Finding the Fourth Proportional to 2,011.86, 3,015.78 and 971.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,011.86 : 3,015.78 = 971.56 : x
2. Step 2: Convert to fraction form
   2,011.86/3,015.78 = 971.56/x
3. Step 3: Cross multiply
   2,011.86x = 3,015.78 × 971.56
4. Step 4: Simplify right side
   2,011.86x = 2,930,011.22
5. Step 5: Solve for x
   x = 2,930,011.22/2,011.86
6. Step 6: Final answer
   x = 1,456.37