Finding the Fourth Proportional to 21,876.86, 30,188.88 and 12,922.34

Step by Step Solution

1. Step 1: Write the proportion equation
   21,876.86 : 30,188.88 = 12,922.34 : x
2. Step 2: Convert to fraction form
   21,876.86/30,188.88 = 12,922.34/x
3. Step 3: Cross multiply
   21,876.86x = 30,188.88 × 12,922.34
4. Step 4: Simplify right side
   21,876.86x = 390,110,971.58
5. Step 5: Solve for x
   x = 390,110,971.58/21,876.86
6. Step 6: Final answer
   x = 17,832.13