Finding the Fourth Proportional to 13,459.50, 18,575.33 and 7,870.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,459.50 : 18,575.33 = 7,870.50 : x
2. Step 2: Convert to fraction form
   13,459.50/18,575.33 = 7,870.50/x
3. Step 3: Cross multiply
   13,459.50x = 18,575.33 × 7,870.50
4. Step 4: Simplify right side
   13,459.50x = 146,197,095.41
5. Step 5: Solve for x
   x = 146,197,095.41/13,459.50
6. Step 6: Final answer
   x = 10,862.00