Finding the Fourth Proportional to 21,499.64, 29,672.40 and 12,068.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,499.64 : 29,672.40 = 12,068.72 : x
2. Step 2: Convert to fraction form
   21,499.64/29,672.40 = 12,068.72/x
3. Step 3: Cross multiply
   21,499.64x = 29,672.40 × 12,068.72
4. Step 4: Simplify right side
   21,499.64x = 358,107,887.33
5. Step 5: Solve for x
   x = 358,107,887.33/21,499.64
6. Step 6: Final answer
   x = 16,656.46