Finding the Fourth Proportional to 2,119.86, 2,925.09 and 1,211.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,119.86 : 2,925.09 = 1,211.30 : x
2. Step 2: Convert to fraction form
   2,119.86/2,925.09 = 1,211.30/x
3. Step 3: Cross multiply
   2,119.86x = 2,925.09 × 1,211.30
4. Step 4: Simplify right side
   2,119.86x = 3,543,168.83
5. Step 5: Solve for x
   x = 3,543,168.83/2,119.86
6. Step 6: Final answer
   x = 1,671.42