Finding the Fourth Proportional to 1,200,456.23, 1,656,682.67 and 691,322.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200,456.23 : 1,656,682.67 = 691,322.63 : x
2. Step 2: Convert to fraction form
   1,200,456.23/1,656,682.67 = 691,322.63/x
3. Step 3: Cross multiply
   1,200,456.23x = 1,656,682.67 × 691,322.63
4. Step 4: Simplify right side
   1,200,456.23x = 1,145,302,220,499.82
5. Step 5: Solve for x
   x = 1,145,302,220,499.82/1,200,456.23
6. Step 6: Final answer
   x = 954,055.79