Finding the Fourth Proportional to 10,875.65, 16,315.90 and 3,480.56

Step by Step Solution

1. Step 1: Write the proportion equation
   10,875.65 : 16,315.90 = 3,480.56 : x
2. Step 2: Convert to fraction form
   10,875.65/16,315.90 = 3,480.56/x
3. Step 3: Cross multiply
   10,875.65x = 16,315.90 × 3,480.56
4. Step 4: Simplify right side
   10,875.65x = 56,788,387.32
5. Step 5: Solve for x
   x = 56,788,387.32/10,875.65
6. Step 6: Final answer
   x = 5,221.61