Finding the Fourth Proportional to 2,385.65, 3,574.84 and 1,213.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,385.65 : 3,574.84 = 1,213.89 : x
2. Step 2: Convert to fraction form
   2,385.65/3,574.84 = 1,213.89/x
3. Step 3: Cross multiply
   2,385.65x = 3,574.84 × 1,213.89
4. Step 4: Simplify right side
   2,385.65x = 4,339,456.46
5. Step 5: Solve for x
   x = 4,339,456.46/2,385.65
6. Step 6: Final answer
   x = 1,818.99