Finding the Fourth Proportional to 1,977.15, 2,728.59 and 1,313.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,977.15 : 2,728.59 = 1,313.55 : x
2. Step 2: Convert to fraction form
   1,977.15/2,728.59 = 1,313.55/x
3. Step 3: Cross multiply
   1,977.15x = 2,728.59 × 1,313.55
4. Step 4: Simplify right side
   1,977.15x = 3,584,139.39
5. Step 5: Solve for x
   x = 3,584,139.39/1,977.15
6. Step 6: Final answer
   x = 1,812.79