Finding the Fourth Proportional to 28,606.50, 42,919.83 and 12,810.24

Step by Step Solution

1. Step 1: Write the proportion equation
   28,606.50 : 42,919.83 = 12,810.24 : x
2. Step 2: Convert to fraction form
   28,606.50/42,919.83 = 12,810.24/x
3. Step 3: Cross multiply
   28,606.50x = 42,919.83 × 12,810.24
4. Step 4: Simplify right side
   28,606.50x = 549,813,323.06
5. Step 5: Solve for x
   x = 549,813,323.06/28,606.50
6. Step 6: Final answer
   x = 19,219.87