Finding the Fourth Proportional to 12,870.96, 19,309.32 and 5,087.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.96 : 19,309.32 = 5,087.76 : x
2. Step 2: Convert to fraction form
   12,870.96/19,309.32 = 5,087.76/x
3. Step 3: Cross multiply
   12,870.96x = 19,309.32 × 5,087.76
4. Step 4: Simplify right side
   12,870.96x = 98,241,185.92
5. Step 5: Solve for x
   x = 98,241,185.92/12,870.96
6. Step 6: Final answer
   x = 7,632.78