Finding the Fourth Proportional to 2,870.86, 3,961.95 and 2,171.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.86 : 3,961.95 = 2,171.02 : x
2. Step 2: Convert to fraction form
   2,870.86/3,961.95 = 2,171.02/x
3. Step 3: Cross multiply
   2,870.86x = 3,961.95 × 2,171.02
4. Step 4: Simplify right side
   2,870.86x = 8,601,472.69
5. Step 5: Solve for x
   x = 8,601,472.69/2,870.86
6. Step 6: Final answer
   x = 2,996.13