Finding the Fourth Proportional to 13,269.31, 18,311.95 and 7,219.89

Step by Step Solution

1. Step 1: Write the proportion equation
   13,269.31 : 18,311.95 = 7,219.89 : x
2. Step 2: Convert to fraction form
   13,269.31/18,311.95 = 7,219.89/x
3. Step 3: Cross multiply
   13,269.31x = 18,311.95 × 7,219.89
4. Step 4: Simplify right side
   13,269.31x = 132,210,264.69
5. Step 5: Solve for x
   x = 132,210,264.69/13,269.31
6. Step 6: Final answer
   x = 9,963.61