Finding the Fourth Proportional to 16,958.31, 23,402.47 and 9,405.80

Step by Step Solution

1. Step 1: Write the proportion equation
   16,958.31 : 23,402.47 = 9,405.80 : x
2. Step 2: Convert to fraction form
   16,958.31/23,402.47 = 9,405.80/x
3. Step 3: Cross multiply
   16,958.31x = 23,402.47 × 9,405.80
4. Step 4: Simplify right side
   16,958.31x = 220,118,807.34
5. Step 5: Solve for x
   x = 220,118,807.34/16,958.31
6. Step 6: Final answer
   x = 12,980.00