Finding the Fourth Proportional to 1,216,530.31, 1,678,665.31 and 672,592.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216,530.31 : 1,678,665.31 = 672,592.63 : x
2. Step 2: Convert to fraction form
   1,216,530.31/1,678,665.31 = 672,592.63/x
3. Step 3: Cross multiply
   1,216,530.31x = 1,678,665.31 × 672,592.63
4. Step 4: Simplify right side
   1,216,530.31x = 1,129,057,915,742.67
5. Step 5: Solve for x
   x = 1,129,057,915,742.67/1,216,530.31
6. Step 6: Final answer
   x = 928,096.82