Finding the Fourth Proportional to 1,216,269.98, 1,678,443.22 and 672,428.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216,269.98 : 1,678,443.22 = 672,428.69 : x
2. Step 2: Convert to fraction form
   1,216,269.98/1,678,443.22 = 672,428.69/x
3. Step 3: Cross multiply
   1,216,269.98x = 1,678,443.22 × 672,428.69
4. Step 4: Simplify right side
   1,216,269.98x = 1,128,633,374,406.46
5. Step 5: Solve for x
   x = 1,128,633,374,406.46/1,216,269.98
6. Step 6: Final answer
   x = 927,946.42