Finding the Fourth Proportional to 4,443.57, 6,666.91 and 1,978.16

Step by Step Solution

1. Step 1: Write the proportion equation
   4,443.57 : 6,666.91 = 1,978.16 : x
2. Step 2: Convert to fraction form
   4,443.57/6,666.91 = 1,978.16/x
3. Step 3: Cross multiply
   4,443.57x = 6,666.91 × 1,978.16
4. Step 4: Simplify right side
   4,443.57x = 13,188,176.41
5. Step 5: Solve for x
   x = 13,188,176.41/4,443.57
6. Step 6: Final answer
   x = 2,967.92