Finding the Fourth Proportional to 10,355.76, 15,530.40 and 3,780.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,355.76 : 15,530.40 = 3,780.72 : x
2. Step 2: Convert to fraction form
   10,355.76/15,530.40 = 3,780.72/x
3. Step 3: Cross multiply
   10,355.76x = 15,530.40 × 3,780.72
4. Step 4: Simplify right side
   10,355.76x = 58,716,093.89
5. Step 5: Solve for x
   x = 58,716,093.89/10,355.76
6. Step 6: Final answer
   x = 5,669.90