Finding the Fourth Proportional to 21,123.72, 31,688.46 and 7,269

Step by Step Solution

1. Step 1: Write the proportion equation
   21,123.72 : 31,688.46 = 7,269 : x
2. Step 2: Convert to fraction form
   21,123.72/31,688.46 = 7,269/x
3. Step 3: Cross multiply
   21,123.72x = 31,688.46 × 7,269
4. Step 4: Simplify right side
   21,123.72x = 230,343,415.74
5. Step 5: Solve for x
   x = 230,343,415.74/21,123.72
6. Step 6: Final answer
   x = 10,904.49