Finding the Fourth Proportional to 1,216,043.71, 1,678,140.69 and 664,761.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216,043.71 : 1,678,140.69 = 664,761.83 : x
2. Step 2: Convert to fraction form
   1,216,043.71/1,678,140.69 = 664,761.83/x
3. Step 3: Cross multiply
   1,216,043.71x = 1,678,140.69 × 664,761.83
4. Step 4: Simplify right side
   1,216,043.71x = 1,115,563,876,081.86
5. Step 5: Solve for x
   x = 1,115,563,876,081.86/1,216,043.71
6. Step 6: Final answer
   x = 917,371.53