Finding the Fourth Proportional to 5,139.07, 7,091.59 and 2,900.64

Step by Step Solution

1. Step 1: Write the proportion equation
   5,139.07 : 7,091.59 = 2,900.64 : x
2. Step 2: Convert to fraction form
   5,139.07/7,091.59 = 2,900.64/x
3. Step 3: Cross multiply
   5,139.07x = 7,091.59 × 2,900.64
4. Step 4: Simplify right side
   5,139.07x = 20,570,149.62
5. Step 5: Solve for x
   x = 20,570,149.62/5,139.07
6. Step 6: Final answer
   x = 4,002.70