Finding the Fourth Proportional to 2,018.21, 3,028.72 and 785.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,018.21 : 3,028.72 = 785.63 : x
2. Step 2: Convert to fraction form
   2,018.21/3,028.72 = 785.63/x
3. Step 3: Cross multiply
   2,018.21x = 3,028.72 × 785.63
4. Step 4: Simplify right side
   2,018.21x = 2,379,458.90
5. Step 5: Solve for x
   x = 2,379,458.90/2,018.21
6. Step 6: Final answer
   x = 1,178.99