Finding the Fourth Proportional to 2,188,993.13, 3,020,611.71 and 1,221,945.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188,993.13 : 3,020,611.71 = 1,221,945.47 : x
2. Step 2: Convert to fraction form
   2,188,993.13/3,020,611.71 = 1,221,945.47/x
3. Step 3: Cross multiply
   2,188,993.13x = 3,020,611.71 × 1,221,945.47
4. Step 4: Simplify right side
   2,188,993.13x = 3,691,022,795,663.45
5. Step 5: Solve for x
   x = 3,691,022,795,663.45/2,188,993.13
6. Step 6: Final answer
   x = 1,686,173.77