Finding the Fourth Proportional to 3,712.51, 5,122.71 and 2,118.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,712.51 : 5,122.71 = 2,118.91 : x
2. Step 2: Convert to fraction form
   3,712.51/5,122.71 = 2,118.91/x
3. Step 3: Cross multiply
   3,712.51x = 5,122.71 × 2,118.91
4. Step 4: Simplify right side
   3,712.51x = 10,854,561.45
5. Step 5: Solve for x
   x = 10,854,561.45/3,712.51
6. Step 6: Final answer
   x = 2,923.78