Finding the Fourth Proportional to 1,200,530.69, 1,656,642.53 and 656,638.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200,530.69 : 1,656,642.53 = 656,638.37 : x
2. Step 2: Convert to fraction form
   1,200,530.69/1,656,642.53 = 656,638.37/x
3. Step 3: Cross multiply
   1,200,530.69x = 1,656,642.53 × 656,638.37
4. Step 4: Simplify right side
   1,200,530.69x = 1,087,815,050,571.88
5. Step 5: Solve for x
   x = 1,087,815,050,571.88/1,200,530.69
6. Step 6: Final answer
   x = 906,111.82