Finding the Fourth Proportional to 13,372, 18,434.06 and 9,380.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,372 : 18,434.06 = 9,380.72 : x
2. Step 2: Convert to fraction form
   13,372/18,434.06 = 9,380.72/x
3. Step 3: Cross multiply
   13,372x = 18,434.06 × 9,380.72
4. Step 4: Simplify right side
   13,372x = 172,924,755.32
5. Step 5: Solve for x
   x = 172,924,755.32/13,372
6. Step 6: Final answer
   x = 12,931.85