Finding the Fourth Proportional to 11,783.97, 17,672.22 and 3,990.96

Step by Step Solution

1. Step 1: Write the proportion equation
   11,783.97 : 17,672.22 = 3,990.96 : x
2. Step 2: Convert to fraction form
   11,783.97/17,672.22 = 3,990.96/x
3. Step 3: Cross multiply
   11,783.97x = 17,672.22 × 3,990.96
4. Step 4: Simplify right side
   11,783.97x = 70,529,123.13
5. Step 5: Solve for x
   x = 70,529,123.13/11,783.97
6. Step 6: Final answer
   x = 5,985.18