Finding the Fourth Proportional to 2,945,128.76, 4,417,699.38 and 815,219

Step by Step Solution

1. Step 1: Write the proportion equation
   2,945,128.76 : 4,417,699.38 = 815,219 : x
2. Step 2: Convert to fraction form
   2,945,128.76/4,417,699.38 = 815,219/x
3. Step 3: Cross multiply
   2,945,128.76x = 4,417,699.38 × 815,219
4. Step 4: Simplify right side
   2,945,128.76x = 3,601,392,470,864.22
5. Step 5: Solve for x
   x = 3,601,392,470,864.22/2,945,128.76
6. Step 6: Final answer
   x = 1,222,830.23