Finding the Fourth Proportional to 5,209.07, 7,188.72 and 2,971.31

Step by Step Solution

1. Step 1: Write the proportion equation
   5,209.07 : 7,188.72 = 2,971.31 : x
2. Step 2: Convert to fraction form
   5,209.07/7,188.72 = 2,971.31/x
3. Step 3: Cross multiply
   5,209.07x = 7,188.72 × 2,971.31
4. Step 4: Simplify right side
   5,209.07x = 21,359,900.77
5. Step 5: Solve for x
   x = 21,359,900.77/5,209.07
6. Step 6: Final answer
   x = 4,100.52