Finding the Fourth Proportional to 2,631.78, 3,944.93 and 1,071.11

Step by Step Solution

1. Step 1: Write the proportion equation
   2,631.78 : 3,944.93 = 1,071.11 : x
2. Step 2: Convert to fraction form
   2,631.78/3,944.93 = 1,071.11/x
3. Step 3: Cross multiply
   2,631.78x = 3,944.93 × 1,071.11
4. Step 4: Simplify right side
   2,631.78x = 4,225,428.89
5. Step 5: Solve for x
   x = 4,225,428.89/2,631.78
6. Step 6: Final answer
   x = 1,605.54