Finding the Fourth Proportional to 1,570.30, 2,356.10 and 789.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.30 : 2,356.10 = 789.89 : x
2. Step 2: Convert to fraction form
   1,570.30/2,356.10 = 789.89/x
3. Step 3: Cross multiply
   1,570.30x = 2,356.10 × 789.89
4. Step 4: Simplify right side
   1,570.30x = 1,861,051.50
5. Step 5: Solve for x
   x = 1,861,051.50/1,570.30
6. Step 6: Final answer
   x = 1,185.15