Finding the Fourth Proportional to 525,223.81, 725,144.06 and 428,658.34

Step by Step Solution

1. Step 1: Write the proportion equation
   525,223.81 : 725,144.06 = 428,658.34 : x
2. Step 2: Convert to fraction form
   525,223.81/725,144.06 = 428,658.34/x
3. Step 3: Cross multiply
   525,223.81x = 725,144.06 × 428,658.34
4. Step 4: Simplify right side
   525,223.81x = 310,839,049,020.46
5. Step 5: Solve for x
   x = 310,839,049,020.46/525,223.81
6. Step 6: Final answer
   x = 591,822.08