Finding the Fourth Proportional to 22,087.84, 30,470.48 and 13,129

Step by Step Solution

1. Step 1: Write the proportion equation
   22,087.84 : 30,470.48 = 13,129 : x
2. Step 2: Convert to fraction form
   22,087.84/30,470.48 = 13,129/x
3. Step 3: Cross multiply
   22,087.84x = 30,470.48 × 13,129
4. Step 4: Simplify right side
   22,087.84x = 400,046,931.92
5. Step 5: Solve for x
   x = 400,046,931.92/22,087.84
6. Step 6: Final answer
   x = 18,111.64