Finding the Fourth Proportional to 2,111.03, 3,166.80 and 877.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.03 : 3,166.80 = 877.76 : x
2. Step 2: Convert to fraction form
   2,111.03/3,166.80 = 877.76/x
3. Step 3: Cross multiply
   2,111.03x = 3,166.80 × 877.76
4. Step 4: Simplify right side
   2,111.03x = 2,779,690.37
5. Step 5: Solve for x
   x = 2,779,690.37/2,111.03
6. Step 6: Final answer
   x = 1,316.75