Finding the Fourth Proportional to 8,784.79, 12,118.82 and 5,426.40

Step by Step Solution

1. Step 1: Write the proportion equation
   8,784.79 : 12,118.82 = 5,426.40 : x
2. Step 2: Convert to fraction form
   8,784.79/12,118.82 = 5,426.40/x
3. Step 3: Cross multiply
   8,784.79x = 12,118.82 × 5,426.40
4. Step 4: Simplify right side
   8,784.79x = 65,761,517.82
5. Step 5: Solve for x
   x = 65,761,517.82/8,784.79
6. Step 6: Final answer
   x = 7,485.84