Finding the Fourth Proportional to 8,789.72, 12,129.95 and 4,811.00

Step by Step Solution

1. Step 1: Write the proportion equation
   8,789.72 : 12,129.95 = 4,811.00 : x
2. Step 2: Convert to fraction form
   8,789.72/12,129.95 = 4,811.00/x
3. Step 3: Cross multiply
   8,789.72x = 12,129.95 × 4,811.00
4. Step 4: Simplify right side
   8,789.72x = 58,357,140.83
5. Step 5: Solve for x
   x = 58,357,140.83/8,789.72
6. Step 6: Final answer
   x = 6,639.25