Finding the Fourth Proportional to 12,817.80, 19,215.30 and 5,020.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,817.80 : 19,215.30 = 5,020.72 : x
2. Step 2: Convert to fraction form
   12,817.80/19,215.30 = 5,020.72/x
3. Step 3: Cross multiply
   12,817.80x = 19,215.30 × 5,020.72
4. Step 4: Simplify right side
   12,817.80x = 96,474,641.02
5. Step 5: Solve for x
   x = 96,474,641.02/12,817.80
6. Step 6: Final answer
   x = 7,526.61