Finding the Fourth Proportional to 13,672.88, 18,868.58 and 7,385.25

Step by Step Solution

1. Step 1: Write the proportion equation
   13,672.88 : 18,868.58 = 7,385.25 : x
2. Step 2: Convert to fraction form
   13,672.88/18,868.58 = 7,385.25/x
3. Step 3: Cross multiply
   13,672.88x = 18,868.58 × 7,385.25
4. Step 4: Simplify right side
   13,672.88x = 139,349,143.52
5. Step 5: Solve for x
   x = 139,349,143.52/13,672.88
6. Step 6: Final answer
   x = 10,191.65