Finding the Fourth Proportional to 12,738.31, 19,101.31 and 5,340.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,738.31 : 19,101.31 = 5,340.78 : x
2. Step 2: Convert to fraction form
   12,738.31/19,101.31 = 5,340.78/x
3. Step 3: Cross multiply
   12,738.31x = 19,101.31 × 5,340.78
4. Step 4: Simplify right side
   12,738.31x = 102,015,881.07
5. Step 5: Solve for x
   x = 102,015,881.07/12,738.31
6. Step 6: Final answer
   x = 8,008.59