Finding the Fourth Proportional to 11,384.34, 17,075.99 and 3,990.47

Step by Step Solution

1. Step 1: Write the proportion equation
   11,384.34 : 17,075.99 = 3,990.47 : x
2. Step 2: Convert to fraction form
   11,384.34/17,075.99 = 3,990.47/x
3. Step 3: Cross multiply
   11,384.34x = 17,075.99 × 3,990.47
4. Step 4: Simplify right side
   11,384.34x = 68,141,120.48
5. Step 5: Solve for x
   x = 68,141,120.48/11,384.34
6. Step 6: Final answer
   x = 5,985.51