Finding the Fourth Proportional to 12,947.82, 19,430.13 and 7,108.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,947.82 : 19,430.13 = 7,108.50 : x
2. Step 2: Convert to fraction form
   12,947.82/19,430.13 = 7,108.50/x
3. Step 3: Cross multiply
   12,947.82x = 19,430.13 × 7,108.50
4. Step 4: Simplify right side
   12,947.82x = 138,119,079.11
5. Step 5: Solve for x
   x = 138,119,079.11/12,947.82
6. Step 6: Final answer
   x = 10,667.36