Finding the Fourth Proportional to 12,156.76, 18,219.30 and 5,488.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,156.76 : 18,219.30 = 5,488.30 : x
2. Step 2: Convert to fraction form
   12,156.76/18,219.30 = 5,488.30/x
3. Step 3: Cross multiply
   12,156.76x = 18,219.30 × 5,488.30
4. Step 4: Simplify right side
   12,156.76x = 99,992,984.19
5. Step 5: Solve for x
   x = 99,992,984.19/12,156.76
6. Step 6: Final answer
   x = 8,225.30