Finding the Fourth Proportional to 1,216,355.88, 1,678,518.42 and 665,061.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216,355.88 : 1,678,518.42 = 665,061.48 : x
2. Step 2: Convert to fraction form
   1,216,355.88/1,678,518.42 = 665,061.48/x
3. Step 3: Cross multiply
   1,216,355.88x = 1,678,518.42 × 665,061.48
4. Step 4: Simplify right side
   1,216,355.88x = 1,116,317,944,612.46
5. Step 5: Solve for x
   x = 1,116,317,944,612.46/1,216,355.88
6. Step 6: Final answer
   x = 917,756.03