Finding the Fourth Proportional to 3,907.83, 5,392.83 and 2,139.45

Step by Step Solution

1. Step 1: Write the proportion equation
   3,907.83 : 5,392.83 = 2,139.45 : x
2. Step 2: Convert to fraction form
   3,907.83/5,392.83 = 2,139.45/x
3. Step 3: Cross multiply
   3,907.83x = 5,392.83 × 2,139.45
4. Step 4: Simplify right side
   3,907.83x = 11,537,663.18
5. Step 5: Solve for x
   x = 11,537,663.18/3,907.83
6. Step 6: Final answer
   x = 2,952.45