Finding the Fourth Proportional to 12,912.78, 19,369.37 and 5,015.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,912.78 : 19,369.37 = 5,015.76 : x
2. Step 2: Convert to fraction form
   12,912.78/19,369.37 = 5,015.76/x
3. Step 3: Cross multiply
   12,912.78x = 19,369.37 × 5,015.76
4. Step 4: Simplify right side
   12,912.78x = 97,152,111.27
5. Step 5: Solve for x
   x = 97,152,111.27/12,912.78
6. Step 6: Final answer
   x = 7,523.72