Finding the Fourth Proportional to 12,488.21, 18,599.81 and 12,427.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,488.21 : 18,599.81 = 12,427.86 : x
2. Step 2: Convert to fraction form
   12,488.21/18,599.81 = 12,427.86/x
3. Step 3: Cross multiply
   12,488.21x = 18,599.81 × 12,427.86
4. Step 4: Simplify right side
   12,488.21x = 231,155,796.03
5. Step 5: Solve for x
   x = 231,155,796.03/12,488.21
6. Step 6: Final answer
   x = 18,509.92