Finding the Fourth Proportional to 16,620.12, 22,978.98 and 15,885.72

Step by Step Solution

1. Step 1: Write the proportion equation
   16,620.12 : 22,978.98 = 15,885.72 : x
2. Step 2: Convert to fraction form
   16,620.12/22,978.98 = 15,885.72/x
3. Step 3: Cross multiply
   16,620.12x = 22,978.98 × 15,885.72
4. Step 4: Simplify right side
   16,620.12x = 365,037,642.17
5. Step 5: Solve for x
   x = 365,037,642.17/16,620.12
6. Step 6: Final answer
   x = 21,963.60