Finding the Fourth Proportional to 2,156.20, 2,975.20 and 1,211.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.20 : 2,975.20 = 1,211.94 : x
2. Step 2: Convert to fraction form
   2,156.20/2,975.20 = 1,211.94/x
3. Step 3: Cross multiply
   2,156.20x = 2,975.20 × 1,211.94
4. Step 4: Simplify right side
   2,156.20x = 3,605,763.89
5. Step 5: Solve for x
   x = 3,605,763.89/2,156.20
6. Step 6: Final answer
   x = 1,672.28