Finding the Fourth Proportional to 5,109.31, 7,051.05 and 2,986.21

Step by Step Solution

1. Step 1: Write the proportion equation
   5,109.31 : 7,051.05 = 2,986.21 : x
2. Step 2: Convert to fraction form
   5,109.31/7,051.05 = 2,986.21/x
3. Step 3: Cross multiply
   5,109.31x = 7,051.05 × 2,986.21
4. Step 4: Simplify right side
   5,109.31x = 21,055,916.02
5. Step 5: Solve for x
   x = 21,055,916.02/5,109.31
6. Step 6: Final answer
   x = 4,121.09