Finding the Fourth Proportional to 8,526.72, 12,785.74 and 3,905.76

Step by Step Solution

1. Step 1: Write the proportion equation
   8,526.72 : 12,785.74 = 3,905.76 : x
2. Step 2: Convert to fraction form
   8,526.72/12,785.74 = 3,905.76/x
3. Step 3: Cross multiply
   8,526.72x = 12,785.74 × 3,905.76
4. Step 4: Simplify right side
   8,526.72x = 49,938,031.86
5. Step 5: Solve for x
   x = 49,938,031.86/8,526.72
6. Step 6: Final answer
   x = 5,856.65