Finding the Fourth Proportional to 12,969.57, 17,970.29 and 12,689.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,969.57 : 17,970.29 = 12,689.31 : x
2. Step 2: Convert to fraction form
   12,969.57/17,970.29 = 12,689.31/x
3. Step 3: Cross multiply
   12,969.57x = 17,970.29 × 12,689.31
4. Step 4: Simplify right side
   12,969.57x = 228,030,580.60
5. Step 5: Solve for x
   x = 228,030,580.60/12,969.57
6. Step 6: Final answer
   x = 17,581.97