Finding the Fourth Proportional to 12,375.72, 18,566.70 and 3,611.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,375.72 : 18,566.70 = 3,611.40 : x
2. Step 2: Convert to fraction form
   12,375.72/18,566.70 = 3,611.40/x
3. Step 3: Cross multiply
   12,375.72x = 18,566.70 × 3,611.40
4. Step 4: Simplify right side
   12,375.72x = 67,051,780.38
5. Step 5: Solve for x
   x = 67,051,780.38/12,375.72
6. Step 6: Final answer
   x = 5,418.01