Finding the Fourth Proportional to 13,155.48, 19,725.90 and 4,385.61

Step by Step Solution

1. Step 1: Write the proportion equation
   13,155.48 : 19,725.90 = 4,385.61 : x
2. Step 2: Convert to fraction form
   13,155.48/19,725.90 = 4,385.61/x
3. Step 3: Cross multiply
   13,155.48x = 19,725.90 × 4,385.61
4. Step 4: Simplify right side
   13,155.48x = 86,510,104.30
5. Step 5: Solve for x
   x = 86,510,104.30/13,155.48
6. Step 6: Final answer
   x = 6,575.97