Finding the Fourth Proportional to 3,980.83, 5,973.64 and 1,385.59

Step by Step Solution

1. Step 1: Write the proportion equation
   3,980.83 : 5,973.64 = 1,385.59 : x
2. Step 2: Convert to fraction form
   3,980.83/5,973.64 = 1,385.59/x
3. Step 3: Cross multiply
   3,980.83x = 5,973.64 × 1,385.59
4. Step 4: Simplify right side
   3,980.83x = 8,277,002.65
5. Step 5: Solve for x
   x = 8,277,002.65/3,980.83
6. Step 6: Final answer
   x = 2,079.22