Finding the Fourth Proportional to 21,300.35, 29,385.23 and 12,681.71

Step by Step Solution

1. Step 1: Write the proportion equation
   21,300.35 : 29,385.23 = 12,681.71 : x
2. Step 2: Convert to fraction form
   21,300.35/29,385.23 = 12,681.71/x
3. Step 3: Cross multiply
   21,300.35x = 29,385.23 × 12,681.71
4. Step 4: Simplify right side
   21,300.35x = 372,654,754.81
5. Step 5: Solve for x
   x = 372,654,754.81/21,300.35
6. Step 6: Final answer
   x = 17,495.25