Finding the Fourth Proportional to 715,443.98, 987,097.39 and 428,859.50

Step by Step Solution

1. Step 1: Write the proportion equation
   715,443.98 : 987,097.39 = 428,859.50 : x
2. Step 2: Convert to fraction form
   715,443.98/987,097.39 = 428,859.50/x
3. Step 3: Cross multiply
   715,443.98x = 987,097.39 × 428,859.50
4. Step 4: Simplify right side
   715,443.98x = 423,326,087,119.07
5. Step 5: Solve for x
   x = 423,326,087,119.07/715,443.98
6. Step 6: Final answer
   x = 591,697.05