Finding the Fourth Proportional to 13,947.29, 19,247.37 and 7,978.59

Step by Step Solution

1. Step 1: Write the proportion equation
   13,947.29 : 19,247.37 = 7,978.59 : x
2. Step 2: Convert to fraction form
   13,947.29/19,247.37 = 7,978.59/x
3. Step 3: Cross multiply
   13,947.29x = 19,247.37 × 7,978.59
4. Step 4: Simplify right side
   13,947.29x = 153,566,833.92
5. Step 5: Solve for x
   x = 153,566,833.92/13,947.29
6. Step 6: Final answer
   x = 11,010.51