Finding the Fourth Proportional to 16,978.41, 23,430.06 and 9,905.90

Step by Step Solution

1. Step 1: Write the proportion equation
   16,978.41 : 23,430.06 = 9,905.90 : x
2. Step 2: Convert to fraction form
   16,978.41/23,430.06 = 9,905.90/x
3. Step 3: Cross multiply
   16,978.41x = 23,430.06 × 9,905.90
4. Step 4: Simplify right side
   16,978.41x = 232,095,714.20
5. Step 5: Solve for x
   x = 232,095,714.20/16,978.41
6. Step 6: Final answer
   x = 13,670.05