Finding the Fourth Proportional to 13,315.72, 18,376.62 and 7,651.40

Step by Step Solution

1. Step 1: Write the proportion equation
   13,315.72 : 18,376.62 = 7,651.40 : x
2. Step 2: Convert to fraction form
   13,315.72/18,376.62 = 7,651.40/x
3. Step 3: Cross multiply
   13,315.72x = 18,376.62 × 7,651.40
4. Step 4: Simplify right side
   13,315.72x = 140,606,870.27
5. Step 5: Solve for x
   x = 140,606,870.27/13,315.72
6. Step 6: Final answer
   x = 10,559.46