Finding the Fourth Proportional to 12,961.67, 19,440.15 and 3,599.34

Step by Step Solution

1. Step 1: Write the proportion equation
   12,961.67 : 19,440.15 = 3,599.34 : x
2. Step 2: Convert to fraction form
   12,961.67/19,440.15 = 3,599.34/x
3. Step 3: Cross multiply
   12,961.67x = 19,440.15 × 3,599.34
4. Step 4: Simplify right side
   12,961.67x = 69,971,643.35
5. Step 5: Solve for x
   x = 69,971,643.35/12,961.67
6. Step 6: Final answer
   x = 5,398.35