Finding the Fourth Proportional to 998,947.72, 1,378,550.55 and 636,293.98

Step by Step Solution

1. Step 1: Write the proportion equation
   998,947.72 : 1,378,550.55 = 636,293.98 : x
2. Step 2: Convert to fraction form
   998,947.72/1,378,550.55 = 636,293.98/x
3. Step 3: Cross multiply
   998,947.72x = 1,378,550.55 × 636,293.98
4. Step 4: Simplify right side
   998,947.72x = 877,163,416,090.69
5. Step 5: Solve for x
   x = 877,163,416,090.69/998,947.72
6. Step 6: Final answer
   x = 878,087.41