Finding the Fourth Proportional to 12,990.18, 19,483.65 and 5,199.06

Step by Step Solution

1. Step 1: Write the proportion equation
   12,990.18 : 19,483.65 = 5,199.06 : x
2. Step 2: Convert to fraction form
   12,990.18/19,483.65 = 5,199.06/x
3. Step 3: Cross multiply
   12,990.18x = 19,483.65 × 5,199.06
4. Step 4: Simplify right side
   12,990.18x = 101,296,665.37
5. Step 5: Solve for x
   x = 101,296,665.37/12,990.18
6. Step 6: Final answer
   x = 7,797.94