Finding the Fourth Proportional to 2,825.69, 4,238.53 and 877.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,825.69 : 4,238.53 = 877.91 : x
2. Step 2: Convert to fraction form
   2,825.69/4,238.53 = 877.91/x
3. Step 3: Cross multiply
   2,825.69x = 4,238.53 × 877.91
4. Step 4: Simplify right side
   2,825.69x = 3,721,024.48
5. Step 5: Solve for x
   x = 3,721,024.48/2,825.69
6. Step 6: Final answer
   x = 1,316.86