Finding the Fourth Proportional to 20,810.01, 31,222.88 and 12,495.83

Step by Step Solution

1. Step 1: Write the proportion equation
   20,810.01 : 31,222.88 = 12,495.83 : x
2. Step 2: Convert to fraction form
   20,810.01/31,222.88 = 12,495.83/x
3. Step 3: Cross multiply
   20,810.01x = 31,222.88 × 12,495.83
4. Step 4: Simplify right side
   20,810.01x = 390,155,800.59
5. Step 5: Solve for x
   x = 390,155,800.59/20,810.01
6. Step 6: Final answer
   x = 18,748.47