Finding the Fourth Proportional to 21,490.42, 29,656.87 and 12,059.02

Step by Step Solution

1. Step 1: Write the proportion equation
   21,490.42 : 29,656.87 = 12,059.02 : x
2. Step 2: Convert to fraction form
   21,490.42/29,656.87 = 12,059.02/x
3. Step 3: Cross multiply
   21,490.42x = 29,656.87 × 12,059.02
4. Step 4: Simplify right side
   21,490.42x = 357,632,788.47
5. Step 5: Solve for x
   x = 357,632,788.47/21,490.42
6. Step 6: Final answer
   x = 16,641.50