Finding the Fourth Proportional to 1,185,982.65, 1,636,653.89 and 642,118.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185,982.65 : 1,636,653.89 = 642,118.37 : x
2. Step 2: Convert to fraction form
   1,185,982.65/1,636,653.89 = 642,118.37/x
3. Step 3: Cross multiply
   1,185,982.65x = 1,636,653.89 × 642,118.37
4. Step 4: Simplify right side
   1,185,982.65x = 1,050,925,521,522.99
5. Step 5: Solve for x
   x = 1,050,925,521,522.99/1,185,982.65
6. Step 6: Final answer
   x = 886,122.17