Finding the Fourth Proportional to 12,986.73, 17,921.76 and 7,612.34

Step by Step Solution

1. Step 1: Write the proportion equation
   12,986.73 : 17,921.76 = 7,612.34 : x
2. Step 2: Convert to fraction form
   12,986.73/17,921.76 = 7,612.34/x
3. Step 3: Cross multiply
   12,986.73x = 17,921.76 × 7,612.34
4. Step 4: Simplify right side
   12,986.73x = 136,426,440.91
5. Step 5: Solve for x
   x = 136,426,440.91/12,986.73
6. Step 6: Final answer
   x = 10,505.06