Finding the Fourth Proportional to 12,715.81, 19,066.55 and 5,217.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,715.81 : 19,066.55 = 5,217.30 : x
2. Step 2: Convert to fraction form
   12,715.81/19,066.55 = 5,217.30/x
3. Step 3: Cross multiply
   12,715.81x = 19,066.55 × 5,217.30
4. Step 4: Simplify right side
   12,715.81x = 99,475,885.23
5. Step 5: Solve for x
   x = 99,475,885.23/12,715.81
6. Step 6: Final answer
   x = 7,823.01