Finding the Fourth Proportional to 2,119.98, 3,156.23 and 2,109.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,119.98 : 3,156.23 = 2,109.72 : x
2. Step 2: Convert to fraction form
   2,119.98/3,156.23 = 2,109.72/x
3. Step 3: Cross multiply
   2,119.98x = 3,156.23 × 2,109.72
4. Step 4: Simplify right side
   2,119.98x = 6,658,778.67
5. Step 5: Solve for x
   x = 6,658,778.67/2,119.98
6. Step 6: Final answer
   x = 3,140.96