Finding the Fourth Proportional to 12,912.32, 19,367.40 and 5,121.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,912.32 : 19,367.40 = 5,121.56 : x
2. Step 2: Convert to fraction form
   12,912.32/19,367.40 = 5,121.56/x
3. Step 3: Cross multiply
   12,912.32x = 19,367.40 × 5,121.56
4. Step 4: Simplify right side
   12,912.32x = 99,191,301.14
5. Step 5: Solve for x
   x = 99,191,301.14/12,912.32
6. Step 6: Final answer
   x = 7,681.91