Finding the Fourth Proportional to 37,420.49, 56,124.59 and 12,457.28

Step by Step Solution

1. Step 1: Write the proportion equation
   37,420.49 : 56,124.59 = 12,457.28 : x
2. Step 2: Convert to fraction form
   37,420.49/56,124.59 = 12,457.28/x
3. Step 3: Cross multiply
   37,420.49x = 56,124.59 × 12,457.28
4. Step 4: Simplify right side
   37,420.49x = 699,159,389.61
5. Step 5: Solve for x
   x = 699,159,389.61/37,420.49
6. Step 6: Final answer
   x = 18,683.87