Finding the Fourth Proportional to 16,870.18, 23,280.68 and 9,316.50

Step by Step Solution

1. Step 1: Write the proportion equation
   16,870.18 : 23,280.68 = 9,316.50 : x
2. Step 2: Convert to fraction form
   16,870.18/23,280.68 = 9,316.50/x
3. Step 3: Cross multiply
   16,870.18x = 23,280.68 × 9,316.50
4. Step 4: Simplify right side
   16,870.18x = 216,894,455.22
5. Step 5: Solve for x
   x = 216,894,455.22/16,870.18
6. Step 6: Final answer
   x = 12,856.68