Finding the Fourth Proportional to 13,672.76, 18,868.43 and 7,385.14

Step by Step Solution

1. Step 1: Write the proportion equation
   13,672.76 : 18,868.43 = 7,385.14 : x
2. Step 2: Convert to fraction form
   13,672.76/18,868.43 = 7,385.14/x
3. Step 3: Cross multiply
   13,672.76x = 18,868.43 × 7,385.14
4. Step 4: Simplify right side
   13,672.76x = 139,345,865.86
5. Step 5: Solve for x
   x = 139,345,865.86/13,672.76
6. Step 6: Final answer
   x = 10,191.50