Finding the Fourth Proportional to 20,155.50, 30,085.31 and 18,671.09

Step by Step Solution

1. Step 1: Write the proportion equation
   20,155.50 : 30,085.31 = 18,671.09 : x
2. Step 2: Convert to fraction form
   20,155.50/30,085.31 = 18,671.09/x
3. Step 3: Cross multiply
   20,155.50x = 30,085.31 × 18,671.09
4. Step 4: Simplify right side
   20,155.50x = 561,725,426.94
5. Step 5: Solve for x
   x = 561,725,426.94/20,155.50
6. Step 6: Final answer
   x = 27,869.59