Finding the Fourth Proportional to 13,839.90, 19,097.17 and 7,870.43

Step by Step Solution

1. Step 1: Write the proportion equation
   13,839.90 : 19,097.17 = 7,870.43 : x
2. Step 2: Convert to fraction form
   13,839.90/19,097.17 = 7,870.43/x
3. Step 3: Cross multiply
   13,839.90x = 19,097.17 × 7,870.43
4. Step 4: Simplify right side
   13,839.90x = 150,302,967.75
5. Step 5: Solve for x
   x = 150,302,967.75/13,839.90
6. Step 6: Final answer
   x = 10,860.12