Finding the Fourth Proportional to 810,859.59, 1,118,978.67 and 448,292.52

Step by Step Solution

1. Step 1: Write the proportion equation
   810,859.59 : 1,118,978.67 = 448,292.52 : x
2. Step 2: Convert to fraction form
   810,859.59/1,118,978.67 = 448,292.52/x
3. Step 3: Cross multiply
   810,859.59x = 1,118,978.67 × 448,292.52
4. Step 4: Simplify right side
   810,859.59x = 501,629,767,800.55
5. Step 5: Solve for x
   x = 501,629,767,800.55/810,859.59
6. Step 6: Final answer
   x = 618,639.50