Finding the Fourth Proportional to 2,829.47, 3,904.81 and 2,129.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,829.47 : 3,904.81 = 2,129.63 : x
2. Step 2: Convert to fraction form
   2,829.47/3,904.81 = 2,129.63/x
3. Step 3: Cross multiply
   2,829.47x = 3,904.81 × 2,129.63
4. Step 4: Simplify right side
   2,829.47x = 8,315,775.67
5. Step 5: Solve for x
   x = 8,315,775.67/2,829.47
6. Step 6: Final answer
   x = 2,938.99