Finding the Fourth Proportional to 21,927.33, 30,264.71 and 12,980.07

Step by Step Solution

1. Step 1: Write the proportion equation
   21,927.33 : 30,264.71 = 12,980.07 : x
2. Step 2: Convert to fraction form
   21,927.33/30,264.71 = 12,980.07/x
3. Step 3: Cross multiply
   21,927.33x = 30,264.71 × 12,980.07
4. Step 4: Simplify right side
   21,927.33x = 392,837,989.43
5. Step 5: Solve for x
   x = 392,837,989.43/21,927.33
6. Step 6: Final answer
   x = 17,915.45