Finding the Fourth Proportional to 22,420.01, 30,938.99 and 12,861.50

Step by Step Solution

1. Step 1: Write the proportion equation
   22,420.01 : 30,938.99 = 12,861.50 : x
2. Step 2: Convert to fraction form
   22,420.01/30,938.99 = 12,861.50/x
3. Step 3: Cross multiply
   22,420.01x = 30,938.99 × 12,861.50
4. Step 4: Simplify right side
   22,420.01x = 397,921,600.88
5. Step 5: Solve for x
   x = 397,921,600.88/22,420.01
6. Step 6: Final answer
   x = 17,748.50