Finding the Fourth Proportional to 12,152.16, 18,215.28 and 5,130.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,152.16 : 18,215.28 = 5,130.72 : x
2. Step 2: Convert to fraction form
   12,152.16/18,215.28 = 5,130.72/x
3. Step 3: Cross multiply
   12,152.16x = 18,215.28 × 5,130.72
4. Step 4: Simplify right side
   12,152.16x = 93,457,501.40
5. Step 5: Solve for x
   x = 93,457,501.40/12,152.16
6. Step 6: Final answer
   x = 7,690.61