Finding the Fourth Proportional to 9,152.46, 12,630.06 and 5,172.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,152.46 : 12,630.06 = 5,172.72 : x
2. Step 2: Convert to fraction form
   9,152.46/12,630.06 = 5,172.72/x
3. Step 3: Cross multiply
   9,152.46x = 12,630.06 × 5,172.72
4. Step 4: Simplify right side
   9,152.46x = 65,331,763.96
5. Step 5: Solve for x
   x = 65,331,763.96/9,152.46
6. Step 6: Final answer
   x = 7,138.16