Finding the Fourth Proportional to 1,977.58, 2,728.72 and 1,138.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,977.58 : 2,728.72 = 1,138.10 : x
2. Step 2: Convert to fraction form
   1,977.58/2,728.72 = 1,138.10/x
3. Step 3: Cross multiply
   1,977.58x = 2,728.72 × 1,138.10
4. Step 4: Simplify right side
   1,977.58x = 3,105,556.23
5. Step 5: Solve for x
   x = 3,105,556.23/1,977.58
6. Step 6: Final answer
   x = 1,570.38