Finding the Fourth Proportional to 21,875.93, 30,178.53 and 12,917.33

Step by Step Solution

1. Step 1: Write the proportion equation
   21,875.93 : 30,178.53 = 12,917.33 : x
2. Step 2: Convert to fraction form
   21,875.93/30,178.53 = 12,917.33/x
3. Step 3: Cross multiply
   21,875.93x = 30,178.53 × 12,917.33
4. Step 4: Simplify right side
   21,875.93x = 389,826,030.92
5. Step 5: Solve for x
   x = 389,826,030.92/21,875.93
6. Step 6: Final answer
   x = 17,819.86