Finding the Fourth Proportional to 22,091.96, 30,478.74 and 13,139.84

Step by Step Solution

1. Step 1: Write the proportion equation
   22,091.96 : 30,478.74 = 13,139.84 : x
2. Step 2: Convert to fraction form
   22,091.96/30,478.74 = 13,139.84/x
3. Step 3: Cross multiply
   22,091.96x = 30,478.74 × 13,139.84
4. Step 4: Simplify right side
   22,091.96x = 400,485,767.00
5. Step 5: Solve for x
   x = 400,485,767.00/22,091.96
6. Step 6: Final answer
   x = 18,128.12