Finding the Fourth Proportional to 13,672.98, 18,868.71 and 7,385.35

Step by Step Solution

1. Step 1: Write the proportion equation
   13,672.98 : 18,868.71 = 7,385.35 : x
2. Step 2: Convert to fraction form
   13,672.98/18,868.71 = 7,385.35/x
3. Step 3: Cross multiply
   13,672.98x = 18,868.71 × 7,385.35
4. Step 4: Simplify right side
   13,672.98x = 139,351,990.47
5. Step 5: Solve for x
   x = 139,351,990.47/13,672.98
6. Step 6: Final answer
   x = 10,191.78