Finding the Fourth Proportional to 1,278,498.42, 1,916,399.34 and 425,341.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,278,498.42 : 1,916,399.34 = 425,341.56 : x
2. Step 2: Convert to fraction form
   1,278,498.42/1,916,399.34 = 425,341.56/x
3. Step 3: Cross multiply
   1,278,498.42x = 1,916,399.34 × 425,341.56
4. Step 4: Simplify right side
   1,278,498.42x = 815,124,284,858.57
5. Step 5: Solve for x
   x = 815,124,284,858.57/1,278,498.42
6. Step 6: Final answer
   x = 637,563.78