Finding the Fourth Proportional to 12,328.62, 17,019.12 and 7,858.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,328.62 : 17,019.12 = 7,858.50 : x
2. Step 2: Convert to fraction form
   12,328.62/17,019.12 = 7,858.50/x
3. Step 3: Cross multiply
   12,328.62x = 17,019.12 × 7,858.50
4. Step 4: Simplify right side
   12,328.62x = 133,744,754.52
5. Step 5: Solve for x
   x = 133,744,754.52/12,328.62
6. Step 6: Final answer
   x = 10,848.32