Finding the Fourth Proportional to 5,155.98, 7,115.27 and 2,798.12

Step by Step Solution

1. Step 1: Write the proportion equation
   5,155.98 : 7,115.27 = 2,798.12 : x
2. Step 2: Convert to fraction form
   5,155.98/7,115.27 = 2,798.12/x
3. Step 3: Cross multiply
   5,155.98x = 7,115.27 × 2,798.12
4. Step 4: Simplify right side
   5,155.98x = 19,909,379.29
5. Step 5: Solve for x
   x = 19,909,379.29/5,155.98
6. Step 6: Final answer
   x = 3,861.42