Finding the Fourth Proportional to 1,387,953.94, 1,915,365.61 and 776,107.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387,953.94 : 1,915,365.61 = 776,107.89 : x
2. Step 2: Convert to fraction form
   1,387,953.94/1,915,365.61 = 776,107.89/x
3. Step 3: Cross multiply
   1,387,953.94x = 1,915,365.61 × 776,107.89
4. Step 4: Simplify right side
   1,387,953.94x = 1,486,530,362,155.66
5. Step 5: Solve for x
   x = 1,486,530,362,155.66/1,387,953.94
6. Step 6: Final answer
   x = 1,071,022.83