Finding the Fourth Proportional to 1,357.30, 1,871.05 and 1,077.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,357.30 : 1,871.05 = 1,077.60 : x
2. Step 2: Convert to fraction form
   1,357.30/1,871.05 = 1,077.60/x
3. Step 3: Cross multiply
   1,357.30x = 1,871.05 × 1,077.60
4. Step 4: Simplify right side
   1,357.30x = 2,016,243.48
5. Step 5: Solve for x
   x = 2,016,243.48/1,357.30
6. Step 6: Final answer
   x = 1,485.48