Finding the Fourth Proportional to 20,123.90, 30,161.55 and 10,258.10

Step by Step Solution

1. Step 1: Write the proportion equation
   20,123.90 : 30,161.55 = 10,258.10 : x
2. Step 2: Convert to fraction form
   20,123.90/30,161.55 = 10,258.10/x
3. Step 3: Cross multiply
   20,123.90x = 30,161.55 × 10,258.10
4. Step 4: Simplify right side
   20,123.90x = 309,400,196.06
5. Step 5: Solve for x
   x = 309,400,196.06/20,123.90
6. Step 6: Final answer
   x = 15,374.76