Finding the Fourth Proportional to 21,947.90, 30,285.90 and 12,386.93

Step by Step Solution

1. Step 1: Write the proportion equation
   21,947.90 : 30,285.90 = 12,386.93 : x
2. Step 2: Convert to fraction form
   21,947.90/30,285.90 = 12,386.93/x
3. Step 3: Cross multiply
   21,947.90x = 30,285.90 × 12,386.93
4. Step 4: Simplify right side
   21,947.90x = 375,149,171.86
5. Step 5: Solve for x
   x = 375,149,171.86/21,947.90
6. Step 6: Final answer
   x = 17,092.72