Finding the Fourth Proportional to 2,151.56, 3,225.42 and 1,225.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,151.56 : 3,225.42 = 1,225.78 : x
2. Step 2: Convert to fraction form
   2,151.56/3,225.42 = 1,225.78/x
3. Step 3: Cross multiply
   2,151.56x = 3,225.42 × 1,225.78
4. Step 4: Simplify right side
   2,151.56x = 3,953,665.41
5. Step 5: Solve for x
   x = 3,953,665.41/2,151.56
6. Step 6: Final answer
   x = 1,837.58