Finding the Fourth Proportional to 1,222,271.37, 1,686,597.69 and 678,430.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222,271.37 : 1,686,597.69 = 678,430.08 : x
2. Step 2: Convert to fraction form
   1,222,271.37/1,686,597.69 = 678,430.08/x
3. Step 3: Cross multiply
   1,222,271.37x = 1,686,597.69 × 678,430.08
4. Step 4: Simplify right side
   1,222,271.37x = 1,144,238,608,298.63
5. Step 5: Solve for x
   x = 1,144,238,608,298.63/1,222,271.37
6. Step 6: Final answer
   x = 936,157.58