Finding the Fourth Proportional to 55,490, 83,243.28 and 20,426.96

Step by Step Solution

1. Step 1: Write the proportion equation
   55,490 : 83,243.28 = 20,426.96 : x
2. Step 2: Convert to fraction form
   55,490/83,243.28 = 20,426.96/x
3. Step 3: Cross multiply
   55,490x = 83,243.28 × 20,426.96
4. Step 4: Simplify right side
   55,490x = 1,700,407,150.83
5. Step 5: Solve for x
   x = 1,700,407,150.83/55,490
6. Step 6: Final answer
   x = 30,643.49