Finding the Fourth Proportional to 13,172.84, 18,178.35 and 7,874.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,172.84 : 18,178.35 = 7,874.72 : x
2. Step 2: Convert to fraction form
   13,172.84/18,178.35 = 7,874.72/x
3. Step 3: Cross multiply
   13,172.84x = 18,178.35 × 7,874.72
4. Step 4: Simplify right side
   13,172.84x = 143,149,416.31
5. Step 5: Solve for x
   x = 143,149,416.31/13,172.84
6. Step 6: Final answer
   x = 10,867.01