Finding the Fourth Proportional to 12,615.98, 18,922.43 and 5,219.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,615.98 : 18,922.43 = 5,219.57 : x
2. Step 2: Convert to fraction form
   12,615.98/18,922.43 = 5,219.57/x
3. Step 3: Cross multiply
   12,615.98x = 18,922.43 × 5,219.57
4. Step 4: Simplify right side
   12,615.98x = 98,767,008.31
5. Step 5: Solve for x
   x = 98,767,008.31/12,615.98
6. Step 6: Final answer
   x = 7,828.73