Finding the Fourth Proportional to 42,802.56, 64,216.77 and 12,817.77

Step by Step Solution

1. Step 1: Write the proportion equation
   42,802.56 : 64,216.77 = 12,817.77 : x
2. Step 2: Convert to fraction form
   42,802.56/64,216.77 = 12,817.77/x
3. Step 3: Cross multiply
   42,802.56x = 64,216.77 × 12,817.77
4. Step 4: Simplify right side
   42,802.56x = 823,115,788.00
5. Step 5: Solve for x
   x = 823,115,788.00/42,802.56
6. Step 6: Final answer
   x = 19,230.53