Finding the Fourth Proportional to 12,915.89, 19,374.20 and 3,556.04

Step by Step Solution

1. Step 1: Write the proportion equation
   12,915.89 : 19,374.20 = 3,556.04 : x
2. Step 2: Convert to fraction form
   12,915.89/19,374.20 = 3,556.04/x
3. Step 3: Cross multiply
   12,915.89x = 19,374.20 × 3,556.04
4. Step 4: Simplify right side
   12,915.89x = 68,895,415.59
5. Step 5: Solve for x
   x = 68,895,415.59/12,915.89
6. Step 6: Final answer
   x = 5,334.16