Finding the Fourth Proportional to 12,998.72, 19,499.16 and 5,206.52

Step by Step Solution

1. Step 1: Write the proportion equation
   12,998.72 : 19,499.16 = 5,206.52 : x
2. Step 2: Convert to fraction form
   12,998.72/19,499.16 = 5,206.52/x
3. Step 3: Cross multiply
   12,998.72x = 19,499.16 × 5,206.52
4. Step 4: Simplify right side
   12,998.72x = 101,522,766.52
5. Step 5: Solve for x
   x = 101,522,766.52/12,998.72
6. Step 6: Final answer
   x = 7,810.21