Finding the Fourth Proportional to 2,111.99, 3,167.71 and 879.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.99 : 3,167.71 = 879.17 : x
2. Step 2: Convert to fraction form
   2,111.99/3,167.71 = 879.17/x
3. Step 3: Cross multiply
   2,111.99x = 3,167.71 × 879.17
4. Step 4: Simplify right side
   2,111.99x = 2,784,937.56
5. Step 5: Solve for x
   x = 2,784,937.56/2,111.99
6. Step 6: Final answer
   x = 1,318.64