Finding the Third Proportional to 12,915 and 28,159.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,915 : 28,159.50 = 28,159.50 : x
2. Step 2: Convert to fraction form
   12,915/28,159.50 = 28,159.50/x
3. Step 3: Cross multiply
   12,915x = 28,159.50 × 28,159.50
4. Step 4: Simplify right side
   12,915x = 792,957,440.25
5. Step 5: Solve for x
   x = 792,957,440.25/12,915
6. Step 6: Final answer
   x = 61,398.18