Finding the Fourth Proportional to 8,405.32, 12,607.56 and 2,561.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,405.32 : 12,607.56 = 2,561.50 : x
2. Step 2: Convert to fraction form
   8,405.32/12,607.56 = 2,561.50/x
3. Step 3: Cross multiply
   8,405.32x = 12,607.56 × 2,561.50
4. Step 4: Simplify right side
   8,405.32x = 32,294,264.94
5. Step 5: Solve for x
   x = 32,294,264.94/8,405.32
6. Step 6: Final answer
   x = 3,842.12