Finding the Fourth Proportional to 20,123.70, 30,153.15 and 10,248.18

Step by Step Solution

1. Step 1: Write the proportion equation
   20,123.70 : 30,153.15 = 10,248.18 : x
2. Step 2: Convert to fraction form
   20,123.70/30,153.15 = 10,248.18/x
3. Step 3: Cross multiply
   20,123.70x = 30,153.15 × 10,248.18
4. Step 4: Simplify right side
   20,123.70x = 309,014,908.77
5. Step 5: Solve for x
   x = 309,014,908.77/20,123.70
6. Step 6: Final answer
   x = 15,355.77