Finding the Fourth Proportional to 2,607.72, 3,911.76 and 877.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,607.72 : 3,911.76 = 877.56 : x
2. Step 2: Convert to fraction form
   2,607.72/3,911.76 = 877.56/x
3. Step 3: Cross multiply
   2,607.72x = 3,911.76 × 877.56
4. Step 4: Simplify right side
   2,607.72x = 3,432,804.11
5. Step 5: Solve for x
   x = 3,432,804.11/2,607.72
6. Step 6: Final answer
   x = 1,316.40