Finding the Fourth Proportional to 5,111.19, 7,662.61 and 2,646.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,111.19 : 7,662.61 = 2,646.72 : x
2. Step 2: Convert to fraction form
   5,111.19/7,662.61 = 2,646.72/x
3. Step 3: Cross multiply
   5,111.19x = 7,662.61 × 2,646.72
4. Step 4: Simplify right side
   5,111.19x = 20,280,783.14
5. Step 5: Solve for x
   x = 20,280,783.14/5,111.19
6. Step 6: Final answer
   x = 3,967.92