Finding the Fourth Proportional to 715,448.48, 987,103.60 and 428,864.00

Step by Step Solution

1. Step 1: Write the proportion equation
   715,448.48 : 987,103.60 = 428,864.00 : x
2. Step 2: Convert to fraction form
   715,448.48/987,103.60 = 428,864.00/x
3. Step 3: Cross multiply
   715,448.48x = 987,103.60 × 428,864.00
4. Step 4: Simplify right side
   715,448.48x = 423,333,192,302.72
5. Step 5: Solve for x
   x = 423,333,192,302.72/715,448.48
6. Step 6: Final answer
   x = 591,703.26