Finding the Fourth Proportional to 1,185,521.67, 1,636,024.23 and 641,664.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185,521.67 : 1,636,024.23 = 641,664.59 : x
2. Step 2: Convert to fraction form
   1,185,521.67/1,636,024.23 = 641,664.59/x
3. Step 3: Cross multiply
   1,185,521.67x = 1,636,024.23 × 641,664.59
4. Step 4: Simplify right side
   1,185,521.67x = 1,049,778,808,592.89
5. Step 5: Solve for x
   x = 1,049,778,808,592.89/1,185,521.67
6. Step 6: Final answer
   x = 885,499.47