Finding the Fourth Proportional to 1,185,982.56, 1,636,656.80 and 642,118.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185,982.56 : 1,636,656.80 = 642,118.72 : x
2. Step 2: Convert to fraction form
   1,185,982.56/1,636,656.80 = 642,118.72/x
3. Step 3: Cross multiply
   1,185,982.56x = 1,636,656.80 × 642,118.72
4. Step 4: Simplify right side
   1,185,982.56x = 1,050,927,969,495.30
5. Step 5: Solve for x
   x = 1,050,927,969,495.30/1,185,982.56
6. Step 6: Final answer
   x = 886,124.30