Finding the Fourth Proportional to 37,644.90, 56,472.72 and 12,339

Step by Step Solution

1. Step 1: Write the proportion equation
   37,644.90 : 56,472.72 = 12,339 : x
2. Step 2: Convert to fraction form
   37,644.90/56,472.72 = 12,339/x
3. Step 3: Cross multiply
   37,644.90x = 56,472.72 × 12,339
4. Step 4: Simplify right side
   37,644.90x = 696,816,892.08
5. Step 5: Solve for x
   x = 696,816,892.08/37,644.90
6. Step 6: Final answer
   x = 18,510.26