Finding the Fourth Proportional to 12,947.80, 19,407.30 and 7,108.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,947.80 : 19,407.30 = 7,108.60 : x
2. Step 2: Convert to fraction form
   12,947.80/19,407.30 = 7,108.60/x
3. Step 3: Cross multiply
   12,947.80x = 19,407.30 × 7,108.60
4. Step 4: Simplify right side
   12,947.80x = 137,958,732.78
5. Step 5: Solve for x
   x = 137,958,732.78/12,947.80
6. Step 6: Final answer
   x = 10,654.99