Finding the Fourth Proportional to 1,570.08, 2,356.38 and 830.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.08 : 2,356.38 = 830.53 : x
2. Step 2: Convert to fraction form
   1,570.08/2,356.38 = 830.53/x
3. Step 3: Cross multiply
   1,570.08x = 2,356.38 × 830.53
4. Step 4: Simplify right side
   1,570.08x = 1,957,039.43
5. Step 5: Solve for x
   x = 1,957,039.43/1,570.08
6. Step 6: Final answer
   x = 1,246.46