Finding the Fourth Proportional to 1,216,498.59, 1,678,738.32 and 672,620.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216,498.59 : 1,678,738.32 = 672,620.58 : x
2. Step 2: Convert to fraction form
   1,216,498.59/1,678,738.32 = 672,620.58/x
3. Step 3: Cross multiply
   1,216,498.59x = 1,678,738.32 × 672,620.58
4. Step 4: Simplify right side
   1,216,498.59x = 1,129,153,942,466.63
5. Step 5: Solve for x
   x = 1,129,153,942,466.63/1,216,498.59
6. Step 6: Final answer
   x = 928,199.96