Finding the Fourth Proportional to 12,913.31, 19,373.22 and 3,679.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,913.31 : 19,373.22 = 3,679.31 : x
2. Step 2: Convert to fraction form
   12,913.31/19,373.22 = 3,679.31/x
3. Step 3: Cross multiply
   12,913.31x = 19,373.22 × 3,679.31
4. Step 4: Simplify right side
   12,913.31x = 71,280,130.51
5. Step 5: Solve for x
   x = 71,280,130.51/12,913.31
6. Step 6: Final answer
   x = 5,519.90