Finding the Fourth Proportional to 12,972.79, 17,902.88 and 7,672.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,972.79 : 17,902.88 = 7,672.15 : x
2. Step 2: Convert to fraction form
   12,972.79/17,902.88 = 7,672.15/x
3. Step 3: Cross multiply
   12,972.79x = 17,902.88 × 7,672.15
4. Step 4: Simplify right side
   12,972.79x = 137,353,510.46
5. Step 5: Solve for x
   x = 137,353,510.46/12,972.79
6. Step 6: Final answer
   x = 10,587.82