Finding the Fourth Proportional to 19,397.89, 29,109.57 and 10,639

Step by Step Solution

1. Step 1: Write the proportion equation
   19,397.89 : 29,109.57 = 10,639 : x
2. Step 2: Convert to fraction form
   19,397.89/29,109.57 = 10,639/x
3. Step 3: Cross multiply
   19,397.89x = 29,109.57 × 10,639
4. Step 4: Simplify right side
   19,397.89x = 309,696,715.23
5. Step 5: Solve for x
   x = 309,696,715.23/19,397.89
6. Step 6: Final answer
   x = 15,965.48