Finding the Fourth Proportional to 21,099.48, 31,631.00 and 10,000.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,099.48 : 31,631.00 = 10,000.50 : x
2. Step 2: Convert to fraction form
   21,099.48/31,631.00 = 10,000.50/x
3. Step 3: Cross multiply
   21,099.48x = 31,631.00 × 10,000.50
4. Step 4: Simplify right side
   21,099.48x = 316,325,765.50
5. Step 5: Solve for x
   x = 316,325,765.50/21,099.48
6. Step 6: Final answer
   x = 14,992.11