Finding the Fourth Proportional to 5,158.47, 7,118.32 and 2,920.57

Step by Step Solution

1. Step 1: Write the proportion equation
   5,158.47 : 7,118.32 = 2,920.57 : x
2. Step 2: Convert to fraction form
   5,158.47/7,118.32 = 2,920.57/x
3. Step 3: Cross multiply
   5,158.47x = 7,118.32 × 2,920.57
4. Step 4: Simplify right side
   5,158.47x = 20,789,551.84
5. Step 5: Solve for x
   x = 20,789,551.84/5,158.47
6. Step 6: Final answer
   x = 4,030.18