Finding the Fourth Proportional to 13,838.65, 19,097.55 and 7,870.49

Step by Step Solution

1. Step 1: Write the proportion equation
   13,838.65 : 19,097.55 = 7,870.49 : x
2. Step 2: Convert to fraction form
   13,838.65/19,097.55 = 7,870.49/x
3. Step 3: Cross multiply
   13,838.65x = 19,097.55 × 7,870.49
4. Step 4: Simplify right side
   13,838.65x = 150,307,076.30
5. Step 5: Solve for x
   x = 150,307,076.30/13,838.65
6. Step 6: Final answer
   x = 10,861.40