Finding the Fourth Proportional to 13,131.88, 19,695.18 and 4,364.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,131.88 : 19,695.18 = 4,364.20 : x
2. Step 2: Convert to fraction form
   13,131.88/19,695.18 = 4,364.20/x
3. Step 3: Cross multiply
   13,131.88x = 19,695.18 × 4,364.20
4. Step 4: Simplify right side
   13,131.88x = 85,953,704.56
5. Step 5: Solve for x
   x = 85,953,704.56/13,131.88
6. Step 6: Final answer
   x = 6,545.42