Finding the Fourth Proportional to 685,106,877.71, 945,285,443.33 and 387,749,113.61

Step by Step Solution

1. Step 1: Write the proportion equation
   685,106,877.71 : 945,285,443.33 = 387,749,113.61 : x
2. Step 2: Convert to fraction form
   685,106,877.71/945,285,443.33 = 387,749,113.61/x
3. Step 3: Cross multiply
   685,106,877.71x = 945,285,443.33 × 387,749,113.61
4. Step 4: Simplify right side
   685,106,877.71x = 366,533,592,752,978,240
5. Step 5: Solve for x
   x = 366,533,592,752,978,240/685,106,877.71
6. Step 6: Final answer
   x = 535,002,062.72