Finding the Fourth Proportional to 743,987.29, 1,026,782.72 and 421,662.78

Step by Step Solution

1. Step 1: Write the proportion equation
   743,987.29 : 1,026,782.72 = 421,662.78 : x
2. Step 2: Convert to fraction form
   743,987.29/1,026,782.72 = 421,662.78/x
3. Step 3: Cross multiply
   743,987.29x = 1,026,782.72 × 421,662.78
4. Step 4: Simplify right side
   743,987.29x = 432,956,061,843.26
5. Step 5: Solve for x
   x = 432,956,061,843.26/743,987.29
6. Step 6: Final answer
   x = 581,940.14