Finding the Fourth Proportional to 21,882.96, 30,196.80 and 12,929.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,882.96 : 30,196.80 = 12,929.76 : x
2. Step 2: Convert to fraction form
   21,882.96/30,196.80 = 12,929.76/x
3. Step 3: Cross multiply
   21,882.96x = 30,196.80 × 12,929.76
4. Step 4: Simplify right side
   21,882.96x = 390,437,376.77
5. Step 5: Solve for x
   x = 390,437,376.77/21,882.96
6. Step 6: Final answer
   x = 17,842.07