Finding the Fourth Proportional to 891,820.72, 1,338,168.48 and 418,544.56

Step by Step Solution

1. Step 1: Write the proportion equation
   891,820.72 : 1,338,168.48 = 418,544.56 : x
2. Step 2: Convert to fraction form
   891,820.72/1,338,168.48 = 418,544.56/x
3. Step 3: Cross multiply
   891,820.72x = 1,338,168.48 × 418,544.56
4. Step 4: Simplify right side
   891,820.72x = 560,083,137,667.47
5. Step 5: Solve for x
   x = 560,083,137,667.47/891,820.72
6. Step 6: Final answer
   x = 628,022.12