Finding the Fourth Proportional to 2,111.14, 3,165.88 and 877.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.14 : 3,165.88 = 877.72 : x
2. Step 2: Convert to fraction form
   2,111.14/3,165.88 = 877.72/x
3. Step 3: Cross multiply
   2,111.14x = 3,165.88 × 877.72
4. Step 4: Simplify right side
   2,111.14x = 2,778,756.19
5. Step 5: Solve for x
   x = 2,778,756.19/2,111.14
6. Step 6: Final answer
   x = 1,316.23