Finding the Fourth Proportional to 1,185,958.98, 1,636,603.57 and 642,090.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185,958.98 : 1,636,603.57 = 642,090.35 : x
2. Step 2: Convert to fraction form
   1,185,958.98/1,636,603.57 = 642,090.35/x
3. Step 3: Cross multiply
   1,185,958.98x = 1,636,603.57 × 642,090.35
4. Step 4: Simplify right side
   1,185,958.98x = 1,050,847,359,072.55
5. Step 5: Solve for x
   x = 1,050,847,359,072.55/1,185,958.98
6. Step 6: Final answer
   x = 886,073.95