Finding the Fourth Proportional to 2,156.20, 2,975.37 and 1,211.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.20 : 2,975.37 = 1,211.86 : x
2. Step 2: Convert to fraction form
   2,156.20/2,975.37 = 1,211.86/x
3. Step 3: Cross multiply
   2,156.20x = 2,975.37 × 1,211.86
4. Step 4: Simplify right side
   2,156.20x = 3,605,731.89
5. Step 5: Solve for x
   x = 3,605,731.89/2,156.20
6. Step 6: Final answer
   x = 1,672.26