Finding the Fourth Proportional to 12,152.72, 18,221.40 and 5,130.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,152.72 : 18,221.40 = 5,130.80 : x
2. Step 2: Convert to fraction form
   12,152.72/18,221.40 = 5,130.80/x
3. Step 3: Cross multiply
   12,152.72x = 18,221.40 × 5,130.80
4. Step 4: Simplify right side
   12,152.72x = 93,490,359.12
5. Step 5: Solve for x
   x = 93,490,359.12/12,152.72
6. Step 6: Final answer
   x = 7,692.96