Finding the Fourth Proportional to 1,570.50, 2,165.80 and 1,144.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.50 : 2,165.80 = 1,144.74 : x
2. Step 2: Convert to fraction form
   1,570.50/2,165.80 = 1,144.74/x
3. Step 3: Cross multiply
   1,570.50x = 2,165.80 × 1,144.74
4. Step 4: Simplify right side
   1,570.50x = 2,479,277.89
5. Step 5: Solve for x
   x = 2,479,277.89/1,570.50
6. Step 6: Final answer
   x = 1,578.66