Finding the Fourth Proportional to 1,207,567.42, 1,666,443.58 and 663,698.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,207,567.42 : 1,666,443.58 = 663,698.72 : x
2. Step 2: Convert to fraction form
   1,207,567.42/1,666,443.58 = 663,698.72/x
3. Step 3: Cross multiply
   1,207,567.42x = 1,666,443.58 × 663,698.72
4. Step 4: Simplify right side
   1,207,567.42x = 1,106,016,470,998.22
5. Step 5: Solve for x
   x = 1,106,016,470,998.22/1,207,567.42
6. Step 6: Final answer
   x = 915,904.53