Finding the Fourth Proportional to 21,591.30, 29,796.05 and 12,518.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,591.30 : 29,796.05 = 12,518.42 : x
2. Step 2: Convert to fraction form
   21,591.30/29,796.05 = 12,518.42/x
3. Step 3: Cross multiply
   21,591.30x = 29,796.05 × 12,518.42
4. Step 4: Simplify right side
   21,591.30x = 372,999,393.75
5. Step 5: Solve for x
   x = 372,999,393.75/21,591.30
6. Step 6: Final answer
   x = 17,275.45