Finding the Fourth Proportional to 2,904.72, 4,010.20 and 1,911.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,904.72 : 4,010.20 = 1,911.72 : x
2. Step 2: Convert to fraction form
   2,904.72/4,010.20 = 1,911.72/x
3. Step 3: Cross multiply
   2,904.72x = 4,010.20 × 1,911.72
4. Step 4: Simplify right side
   2,904.72x = 7,666,379.54
5. Step 5: Solve for x
   x = 7,666,379.54/2,904.72
6. Step 6: Final answer
   x = 2,639.28