Finding the Fourth Proportional to 13,433.53, 20,152.72 and 4,428.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,433.53 : 20,152.72 = 4,428.12 : x
2. Step 2: Convert to fraction form
   13,433.53/20,152.72 = 4,428.12/x
3. Step 3: Cross multiply
   13,433.53x = 20,152.72 × 4,428.12
4. Step 4: Simplify right side
   13,433.53x = 89,238,662.49
5. Step 5: Solve for x
   x = 89,238,662.49/13,433.53
6. Step 6: Final answer
   x = 6,642.98