Finding the Fourth Proportional to 21,688.66, 32,510.83 and 12,308.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,688.66 : 32,510.83 = 12,308.88 : x
2. Step 2: Convert to fraction form
   21,688.66/32,510.83 = 12,308.88/x
3. Step 3: Cross multiply
   21,688.66x = 32,510.83 × 12,308.88
4. Step 4: Simplify right side
   21,688.66x = 400,171,905.17
5. Step 5: Solve for x
   x = 400,171,905.17/21,688.66
6. Step 6: Final answer
   x = 18,450.74