Finding the Fourth Proportional to 2,988.37, 4,456.24 and 2,780.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,988.37 : 4,456.24 = 2,780.61 : x
2. Step 2: Convert to fraction form
   2,988.37/4,456.24 = 2,780.61/x
3. Step 3: Cross multiply
   2,988.37x = 4,456.24 × 2,780.61
4. Step 4: Simplify right side
   2,988.37x = 12,391,065.51
5. Step 5: Solve for x
   x = 12,391,065.51/2,988.37
6. Step 6: Final answer
   x = 4,146.43