Finding the Fourth Proportional to 12,969.58, 17,970.30 and 12,689.32

Step by Step Solution

1. Step 1: Write the proportion equation
   12,969.58 : 17,970.30 = 12,689.32 : x
2. Step 2: Convert to fraction form
   12,969.58/17,970.30 = 12,689.32/x
3. Step 3: Cross multiply
   12,969.58x = 17,970.30 × 12,689.32
4. Step 4: Simplify right side
   12,969.58x = 228,030,733.90
5. Step 5: Solve for x
   x = 228,030,733.90/12,969.58
6. Step 6: Final answer
   x = 17,581.97