Finding the Fourth Proportional to 21,346.71, 29,456.90 and 12,392.53

Step by Step Solution

1. Step 1: Write the proportion equation
   21,346.71 : 29,456.90 = 12,392.53 : x
2. Step 2: Convert to fraction form
   21,346.71/29,456.90 = 12,392.53/x
3. Step 3: Cross multiply
   21,346.71x = 29,456.90 × 12,392.53
4. Step 4: Simplify right side
   21,346.71x = 365,045,427.82
5. Step 5: Solve for x
   x = 365,045,427.82/21,346.71
6. Step 6: Final answer
   x = 17,100.78