Finding the Fourth Proportional to 2,920.69, 4,378.42 and 1,071.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,920.69 : 4,378.42 = 1,071.37 : x
2. Step 2: Convert to fraction form
   2,920.69/4,378.42 = 1,071.37/x
3. Step 3: Cross multiply
   2,920.69x = 4,378.42 × 1,071.37
4. Step 4: Simplify right side
   2,920.69x = 4,690,907.84
5. Step 5: Solve for x
   x = 4,690,907.84/2,920.69
6. Step 6: Final answer
   x = 1,606.10