Finding the Fourth Proportional to 5,428.45, 8,136.38 and 2,500.61

Step by Step Solution

1. Step 1: Write the proportion equation
   5,428.45 : 8,136.38 = 2,500.61 : x
2. Step 2: Convert to fraction form
   5,428.45/8,136.38 = 2,500.61/x
3. Step 3: Cross multiply
   5,428.45x = 8,136.38 × 2,500.61
4. Step 4: Simplify right side
   5,428.45x = 20,345,878.76
5. Step 5: Solve for x
   x = 20,345,878.76/5,428.45
6. Step 6: Final answer
   x = 3,748.01