Finding the Fourth Proportional to 21,317.18, 29,412.72 and 12,359.59

Step by Step Solution

1. Step 1: Write the proportion equation
   21,317.18 : 29,412.72 = 12,359.59 : x
2. Step 2: Convert to fraction form
   21,317.18/29,412.72 = 12,359.59/x
3. Step 3: Cross multiply
   21,317.18x = 29,412.72 × 12,359.59
4. Step 4: Simplify right side
   21,317.18x = 363,529,086.45
5. Step 5: Solve for x
   x = 363,529,086.45/21,317.18
6. Step 6: Final answer
   x = 17,053.34