Finding the Fourth Proportional to 19,643.31, 29,464.81 and 13,009.50

Step by Step Solution

1. Step 1: Write the proportion equation
   19,643.31 : 29,464.81 = 13,009.50 : x
2. Step 2: Convert to fraction form
   19,643.31/29,464.81 = 13,009.50/x
3. Step 3: Cross multiply
   19,643.31x = 29,464.81 × 13,009.50
4. Step 4: Simplify right side
   19,643.31x = 383,322,445.70
5. Step 5: Solve for x
   x = 383,322,445.70/19,643.31
6. Step 6: Final answer
   x = 19,514.15