Finding the Fourth Proportional to 21,347.89, 29,457.81 and 12,393.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,347.89 : 29,457.81 = 12,393.72 : x
2. Step 2: Convert to fraction form
   21,347.89/29,457.81 = 12,393.72/x
3. Step 3: Cross multiply
   21,347.89x = 29,457.81 × 12,393.72
4. Step 4: Simplify right side
   21,347.89x = 365,091,761.72
5. Step 5: Solve for x
   x = 365,091,761.72/21,347.89
6. Step 6: Final answer
   x = 17,102.01