Finding the Fourth Proportional to 8,525.79, 12,789.90 and 2,979.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,525.79 : 12,789.90 = 2,979.72 : x
2. Step 2: Convert to fraction form
   8,525.79/12,789.90 = 2,979.72/x
3. Step 3: Cross multiply
   8,525.79x = 12,789.90 × 2,979.72
4. Step 4: Simplify right side
   8,525.79x = 38,110,320.83
5. Step 5: Solve for x
   x = 38,110,320.83/8,525.79
6. Step 6: Final answer
   x = 4,470.00