Finding the Fourth Proportional to 21,308.02, 29,407.57 and 12,814.47

Step by Step Solution

1. Step 1: Write the proportion equation
   21,308.02 : 29,407.57 = 12,814.47 : x
2. Step 2: Convert to fraction form
   21,308.02/29,407.57 = 12,814.47/x
3. Step 3: Cross multiply
   21,308.02x = 29,407.57 × 12,814.47
4. Step 4: Simplify right side
   21,308.02x = 376,842,391.50
5. Step 5: Solve for x
   x = 376,842,391.50/21,308.02
6. Step 6: Final answer
   x = 17,685.47