Finding the Fourth Proportional to 5,406.95, 8,112.86 and 2,636.15

Step by Step Solution

1. Step 1: Write the proportion equation
   5,406.95 : 8,112.86 = 2,636.15 : x
2. Step 2: Convert to fraction form
   5,406.95/8,112.86 = 2,636.15/x
3. Step 3: Cross multiply
   5,406.95x = 8,112.86 × 2,636.15
4. Step 4: Simplify right side
   5,406.95x = 21,386,672.03
5. Step 5: Solve for x
   x = 21,386,672.03/5,406.95
6. Step 6: Final answer
   x = 3,955.40