Finding the Fourth Proportional to 685,861.67, 946,737.55 and 558,315.83

Step by Step Solution

1. Step 1: Write the proportion equation
   685,861.67 : 946,737.55 = 558,315.83 : x
2. Step 2: Convert to fraction form
   685,861.67/946,737.55 = 558,315.83/x
3. Step 3: Cross multiply
   685,861.67x = 946,737.55 × 558,315.83
4. Step 4: Simplify right side
   685,861.67x = 528,578,564,085.16
5. Step 5: Solve for x
   x = 528,578,564,085.16/685,861.67
6. Step 6: Final answer
   x = 770,678.09