Finding the Fourth Proportional to 15,309.59, 21,128.18 and 10,196.34

Step by Step Solution

1. Step 1: Write the proportion equation
   15,309.59 : 21,128.18 = 10,196.34 : x
2. Step 2: Convert to fraction form
   15,309.59/21,128.18 = 10,196.34/x
3. Step 3: Cross multiply
   15,309.59x = 21,128.18 × 10,196.34
4. Step 4: Simplify right side
   15,309.59x = 215,430,055.88
5. Step 5: Solve for x
   x = 215,430,055.88/15,309.59
6. Step 6: Final answer
   x = 14,071.58