Finding the Fourth Proportional to 2,157.72, 2,977.56 and 1,213.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,157.72 : 2,977.56 = 1,213.50 : x
2. Step 2: Convert to fraction form
   2,157.72/2,977.56 = 1,213.50/x
3. Step 3: Cross multiply
   2,157.72x = 2,977.56 × 1,213.50
4. Step 4: Simplify right side
   2,157.72x = 3,613,269.06
5. Step 5: Solve for x
   x = 3,613,269.06/2,157.72
6. Step 6: Final answer
   x = 1,674.58