Finding the Fourth Proportional to 12,200.72, 18,302.16 and 3,435.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,200.72 : 18,302.16 = 3,435.72 : x
2. Step 2: Convert to fraction form
   12,200.72/18,302.16 = 3,435.72/x
3. Step 3: Cross multiply
   12,200.72x = 18,302.16 × 3,435.72
4. Step 4: Simplify right side
   12,200.72x = 62,881,097.16
5. Step 5: Solve for x
   x = 62,881,097.16/12,200.72
6. Step 6: Final answer
   x = 5,153.88