Finding the Fourth Proportional to 102,366.57, 153,456.30 and 86,672.72

Step by Step Solution

1. Step 1: Write the proportion equation
   102,366.57 : 153,456.30 = 86,672.72 : x
2. Step 2: Convert to fraction form
   102,366.57/153,456.30 = 86,672.72/x
3. Step 3: Cross multiply
   102,366.57x = 153,456.30 × 86,672.72
4. Step 4: Simplify right side
   102,366.57x = 13,300,474,922.14
5. Step 5: Solve for x
   x = 13,300,474,922.14/102,366.57
6. Step 6: Final answer
   x = 129,929.87