Finding the Fourth Proportional to 12,947.59, 17,868.11 and 7,642.29

Step by Step Solution

1. Step 1: Write the proportion equation
   12,947.59 : 17,868.11 = 7,642.29 : x
2. Step 2: Convert to fraction form
   12,947.59/17,868.11 = 7,642.29/x
3. Step 3: Cross multiply
   12,947.59x = 17,868.11 × 7,642.29
4. Step 4: Simplify right side
   12,947.59x = 136,553,278.37
5. Step 5: Solve for x
   x = 136,553,278.37/12,947.59
6. Step 6: Final answer
   x = 10,546.62