Finding the Fourth Proportional to 12,312.72, 16,989.58 and 7,007.63

Step by Step Solution

1. Step 1: Write the proportion equation
   12,312.72 : 16,989.58 = 7,007.63 : x
2. Step 2: Convert to fraction form
   12,312.72/16,989.58 = 7,007.63/x
3. Step 3: Cross multiply
   12,312.72x = 16,989.58 × 7,007.63
4. Step 4: Simplify right side
   12,312.72x = 119,056,570.51
5. Step 5: Solve for x
   x = 119,056,570.51/12,312.72
6. Step 6: Final answer
   x = 9,669.40