Finding the Fourth Proportional to 2,157.69, 2,977.56 and 1,213.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,157.69 : 2,977.56 = 1,213.47 : x
2. Step 2: Convert to fraction form
   2,157.69/2,977.56 = 1,213.47/x
3. Step 3: Cross multiply
   2,157.69x = 2,977.56 × 1,213.47
4. Step 4: Simplify right side
   2,157.69x = 3,613,179.73
5. Step 5: Solve for x
   x = 3,613,179.73/2,157.69
6. Step 6: Final answer
   x = 1,674.56