Finding the Fourth Proportional to 22,086.17, 30,468.86 and 13,128.59

Step by Step Solution

1. Step 1: Write the proportion equation
   22,086.17 : 30,468.86 = 13,128.59 : x
2. Step 2: Convert to fraction form
   22,086.17/30,468.86 = 13,128.59/x
3. Step 3: Cross multiply
   22,086.17x = 30,468.86 × 13,128.59
4. Step 4: Simplify right side
   22,086.17x = 400,013,051.18
5. Step 5: Solve for x
   x = 400,013,051.18/22,086.17
6. Step 6: Final answer
   x = 18,111.47