Finding the Fourth Proportional to 1,047.30, 1,570.38 and 677.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.30 : 1,570.38 = 677.05 : x
2. Step 2: Convert to fraction form
   1,047.30/1,570.38 = 677.05/x
3. Step 3: Cross multiply
   1,047.30x = 1,570.38 × 677.05
4. Step 4: Simplify right side
   1,047.30x = 1,063,222.39
5. Step 5: Solve for x
   x = 1,063,222.39/1,047.30
6. Step 6: Final answer
   x = 1,015.20