Finding the Fourth Proportional to 12,980.58, 17,905.83 and 8,781.54

Step by Step Solution

1. Step 1: Write the proportion equation
   12,980.58 : 17,905.83 = 8,781.54 : x
2. Step 2: Convert to fraction form
   12,980.58/17,905.83 = 8,781.54/x
3. Step 3: Cross multiply
   12,980.58x = 17,905.83 × 8,781.54
4. Step 4: Simplify right side
   12,980.58x = 157,240,762.38
5. Step 5: Solve for x
   x = 157,240,762.38/12,980.58
6. Step 6: Final answer
   x = 12,113.54