Finding the Fourth Proportional to 12,355.61, 17,050.78 and 6,690.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,355.61 : 17,050.78 = 6,690.42 : x
2. Step 2: Convert to fraction form
   12,355.61/17,050.78 = 6,690.42/x
3. Step 3: Cross multiply
   12,355.61x = 17,050.78 × 6,690.42
4. Step 4: Simplify right side
   12,355.61x = 114,076,896.25
5. Step 5: Solve for x
   x = 114,076,896.25/12,355.61
6. Step 6: Final answer
   x = 9,232.80