Finding the Fourth Proportional to 21,671.72, 32,488.12 and 7,817.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,671.72 : 32,488.12 = 7,817.48 : x
2. Step 2: Convert to fraction form
   21,671.72/32,488.12 = 7,817.48/x
3. Step 3: Cross multiply
   21,671.72x = 32,488.12 × 7,817.48
4. Step 4: Simplify right side
   21,671.72x = 253,975,228.34
5. Step 5: Solve for x
   x = 253,975,228.34/21,671.72
6. Step 6: Final answer
   x = 11,719.20