Finding the Fourth Proportional to 13,131.39, 19,689.78 and 4,361.52

Step by Step Solution

1. Step 1: Write the proportion equation
   13,131.39 : 19,689.78 = 4,361.52 : x
2. Step 2: Convert to fraction form
   13,131.39/19,689.78 = 4,361.52/x
3. Step 3: Cross multiply
   13,131.39x = 19,689.78 × 4,361.52
4. Step 4: Simplify right side
   13,131.39x = 85,877,369.27
5. Step 5: Solve for x
   x = 85,877,369.27/13,131.39
6. Step 6: Final answer
   x = 6,539.85