Finding the Fourth Proportional to 2,412.18, 3,618.53 and 768.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,412.18 : 3,618.53 = 768.15 : x
2. Step 2: Convert to fraction form
   2,412.18/3,618.53 = 768.15/x
3. Step 3: Cross multiply
   2,412.18x = 3,618.53 × 768.15
4. Step 4: Simplify right side
   2,412.18x = 2,779,573.82
5. Step 5: Solve for x
   x = 2,779,573.82/2,412.18
6. Step 6: Final answer
   x = 1,152.31