Finding the Fourth Proportional to 55,428.34, 83,139.99 and 20,365.42

Step by Step Solution

1. Step 1: Write the proportion equation
   55,428.34 : 83,139.99 = 20,365.42 : x
2. Step 2: Convert to fraction form
   55,428.34/83,139.99 = 20,365.42/x
3. Step 3: Cross multiply
   55,428.34x = 83,139.99 × 20,365.42
4. Step 4: Simplify right side
   55,428.34x = 1,693,180,815.15
5. Step 5: Solve for x
   x = 1,693,180,815.15/55,428.34
6. Step 6: Final answer
   x = 30,547.20