Finding the Fourth Proportional to 12,828.54, 17,698.50 and 7,790.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,828.54 : 17,698.50 = 7,790.86 : x
2. Step 2: Convert to fraction form
   12,828.54/17,698.50 = 7,790.86/x
3. Step 3: Cross multiply
   12,828.54x = 17,698.50 × 7,790.86
4. Step 4: Simplify right side
   12,828.54x = 137,886,535.71
5. Step 5: Solve for x
   x = 137,886,535.71/12,828.54
6. Step 6: Final answer
   x = 10,748.42