Finding the Fourth Proportional to 55,173, 82,759.71 and 13,620

Step by Step Solution

1. Step 1: Write the proportion equation
   55,173 : 82,759.71 = 13,620 : x
2. Step 2: Convert to fraction form
   55,173/82,759.71 = 13,620/x
3. Step 3: Cross multiply
   55,173x = 82,759.71 × 13,620
4. Step 4: Simplify right side
   55,173x = 1,127,187,250.20
5. Step 5: Solve for x
   x = 1,127,187,250.20/55,173
6. Step 6: Final answer
   x = 20,430.05