Finding the Fourth Proportional to 1,570.72, 2,355.27 and 830.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.72 : 2,355.27 = 830.73 : x
2. Step 2: Convert to fraction form
   1,570.72/2,355.27 = 830.73/x
3. Step 3: Cross multiply
   1,570.72x = 2,355.27 × 830.73
4. Step 4: Simplify right side
   1,570.72x = 1,956,593.45
5. Step 5: Solve for x
   x = 1,956,593.45/1,570.72
6. Step 6: Final answer
   x = 1,245.67