Finding the Fourth Proportional to 11,921, 17,875.71 and 3,599.42

Step by Step Solution

1. Step 1: Write the proportion equation
   11,921 : 17,875.71 = 3,599.42 : x
2. Step 2: Convert to fraction form
   11,921/17,875.71 = 3,599.42/x
3. Step 3: Cross multiply
   11,921x = 17,875.71 × 3,599.42
4. Step 4: Simplify right side
   11,921x = 64,342,188.09
5. Step 5: Solve for x
   x = 64,342,188.09/11,921
6. Step 6: Final answer
   x = 5,397.38