Finding the Fourth Proportional to 2,384.72, 3,578.06 and 1,287.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,384.72 : 3,578.06 = 1,287.80 : x
2. Step 2: Convert to fraction form
   2,384.72/3,578.06 = 1,287.80/x
3. Step 3: Cross multiply
   2,384.72x = 3,578.06 × 1,287.80
4. Step 4: Simplify right side
   2,384.72x = 4,607,811.00
5. Step 5: Solve for x
   x = 4,607,811.00/2,384.72
6. Step 6: Final answer
   x = 1,932.23