Finding the Fourth Proportional to 13,839.56, 19,098.69 and 7,870.88

Step by Step Solution

1. Step 1: Write the proportion equation
   13,839.56 : 19,098.69 = 7,870.88 : x
2. Step 2: Convert to fraction form
   13,839.56/19,098.69 = 7,870.88/x
3. Step 3: Cross multiply
   13,839.56x = 19,098.69 × 7,870.88
4. Step 4: Simplify right side
   13,839.56x = 150,323,497.15
5. Step 5: Solve for x
   x = 150,323,497.15/13,839.56
6. Step 6: Final answer
   x = 10,861.87