Finding the Fourth Proportional to 20,433.61, 30,646.72 and 5,638.87

Step by Step Solution

1. Step 1: Write the proportion equation
   20,433.61 : 30,646.72 = 5,638.87 : x
2. Step 2: Convert to fraction form
   20,433.61/30,646.72 = 5,638.87/x
3. Step 3: Cross multiply
   20,433.61x = 30,646.72 × 5,638.87
4. Step 4: Simplify right side
   20,433.61x = 172,812,870.01
5. Step 5: Solve for x
   x = 172,812,870.01/20,433.61
6. Step 6: Final answer
   x = 8,457.29