Finding the Fourth Proportional to 16,329.30, 22,539.51 and 12,978.06

Step by Step Solution

1. Step 1: Write the proportion equation
   16,329.30 : 22,539.51 = 12,978.06 : x
2. Step 2: Convert to fraction form
   16,329.30/22,539.51 = 12,978.06/x
3. Step 3: Cross multiply
   16,329.30x = 22,539.51 × 12,978.06
4. Step 4: Simplify right side
   16,329.30x = 292,519,113.15
5. Step 5: Solve for x
   x = 292,519,113.15/16,329.30
6. Step 6: Final answer
   x = 17,913.76