Finding the Fourth Proportional to 877,185.76, 1,315,826.49 and 278,103.59

Step by Step Solution

1. Step 1: Write the proportion equation
   877,185.76 : 1,315,826.49 = 278,103.59 : x
2. Step 2: Convert to fraction form
   877,185.76/1,315,826.49 = 278,103.59/x
3. Step 3: Cross multiply
   877,185.76x = 1,315,826.49 × 278,103.59
4. Step 4: Simplify right side
   877,185.76x = 365,936,070,686.10
5. Step 5: Solve for x
   x = 365,936,070,686.10/877,185.76
6. Step 6: Final answer
   x = 417,170.56