Finding the Fourth Proportional to 22,061.44, 30,440.64 and 13,680

Step by Step Solution

1. Step 1: Write the proportion equation
   22,061.44 : 30,440.64 = 13,680 : x
2. Step 2: Convert to fraction form
   22,061.44/30,440.64 = 13,680/x
3. Step 3: Cross multiply
   22,061.44x = 30,440.64 × 13,680
4. Step 4: Simplify right side
   22,061.44x = 416,427,955.20
5. Step 5: Solve for x
   x = 416,427,955.20/22,061.44
6. Step 6: Final answer
   x = 18,875.83