Finding the Fourth Proportional to 3,904.89, 5,388.71 and 2,136.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,904.89 : 5,388.71 = 2,136.50 : x
2. Step 2: Convert to fraction form
   3,904.89/5,388.71 = 2,136.50/x
3. Step 3: Cross multiply
   3,904.89x = 5,388.71 × 2,136.50
4. Step 4: Simplify right side
   3,904.89x = 11,512,978.92
5. Step 5: Solve for x
   x = 11,512,978.92/3,904.89
6. Step 6: Final answer
   x = 2,948.35