Finding the Fourth Proportional to 12,586.56, 18,853.91 and 7,379.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,586.56 : 18,853.91 = 7,379.88 : x
2. Step 2: Convert to fraction form
   12,586.56/18,853.91 = 7,379.88/x
3. Step 3: Cross multiply
   12,586.56x = 18,853.91 × 7,379.88
4. Step 4: Simplify right side
   12,586.56x = 139,139,499.06
5. Step 5: Solve for x
   x = 139,139,499.06/12,586.56
6. Step 6: Final answer
   x = 11,054.61