Finding the Fourth Proportional to 1,772.15, 2,658.69 and 1,578.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,772.15 : 2,658.69 = 1,578.47 : x
2. Step 2: Convert to fraction form
   1,772.15/2,658.69 = 1,578.47/x
3. Step 3: Cross multiply
   1,772.15x = 2,658.69 × 1,578.47
4. Step 4: Simplify right side
   1,772.15x = 4,196,662.40
5. Step 5: Solve for x
   x = 4,196,662.40/1,772.15
6. Step 6: Final answer
   x = 2,368.13