Finding the Fourth Proportional to 12,840.52, 17,698.74 and 8,590.05

Step by Step Solution

1. Step 1: Write the proportion equation
   12,840.52 : 17,698.74 = 8,590.05 : x
2. Step 2: Convert to fraction form
   12,840.52/17,698.74 = 8,590.05/x
3. Step 3: Cross multiply
   12,840.52x = 17,698.74 × 8,590.05
4. Step 4: Simplify right side
   12,840.52x = 152,033,061.54
5. Step 5: Solve for x
   x = 152,033,061.54/12,840.52
6. Step 6: Final answer
   x = 11,840.10