Finding the Fourth Proportional to 12,931.23, 19,398.66 and 4,608.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,931.23 : 19,398.66 = 4,608.78 : x
2. Step 2: Convert to fraction form
   12,931.23/19,398.66 = 4,608.78/x
3. Step 3: Cross multiply
   12,931.23x = 19,398.66 × 4,608.78
4. Step 4: Simplify right side
   12,931.23x = 89,404,156.23
5. Step 5: Solve for x
   x = 89,404,156.23/12,931.23
6. Step 6: Final answer
   x = 6,913.82