Finding the Fourth Proportional to 22,303.76, 30,778.38 and 12,870.50

Step by Step Solution

1. Step 1: Write the proportion equation
   22,303.76 : 30,778.38 = 12,870.50 : x
2. Step 2: Convert to fraction form
   22,303.76/30,778.38 = 12,870.50/x
3. Step 3: Cross multiply
   22,303.76x = 30,778.38 × 12,870.50
4. Step 4: Simplify right side
   22,303.76x = 396,132,985.90
5. Step 5: Solve for x
   x = 396,132,985.90/22,303.76
6. Step 6: Final answer
   x = 17,760.82