Finding the Fourth Proportional to 2,157.70, 2,977.77 and 1,213.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,157.70 : 2,977.77 = 1,213.59 : x
2. Step 2: Convert to fraction form
   2,157.70/2,977.77 = 1,213.59/x
3. Step 3: Cross multiply
   2,157.70x = 2,977.77 × 1,213.59
4. Step 4: Simplify right side
   2,157.70x = 3,613,773.72
5. Step 5: Solve for x
   x = 3,613,773.72/2,157.70
6. Step 6: Final answer
   x = 1,674.83