Finding the Fourth Proportional to 15,433, 21,288.42 and 10,129.96

Step by Step Solution

1. Step 1: Write the proportion equation
   15,433 : 21,288.42 = 10,129.96 : x
2. Step 2: Convert to fraction form
   15,433/21,288.42 = 10,129.96/x
3. Step 3: Cross multiply
   15,433x = 21,288.42 × 10,129.96
4. Step 4: Simplify right side
   15,433x = 215,650,843.06
5. Step 5: Solve for x
   x = 215,650,843.06/15,433
6. Step 6: Final answer
   x = 13,973.36