Finding the Fourth Proportional to 12,153.31, 18,222.78 and 4,749.19

Step by Step Solution

1. Step 1: Write the proportion equation
   12,153.31 : 18,222.78 = 4,749.19 : x
2. Step 2: Convert to fraction form
   12,153.31/18,222.78 = 4,749.19/x
3. Step 3: Cross multiply
   12,153.31x = 18,222.78 × 4,749.19
4. Step 4: Simplify right side
   12,153.31x = 86,543,444.55
5. Step 5: Solve for x
   x = 86,543,444.55/12,153.31
6. Step 6: Final answer
   x = 7,120.98