Finding the Fourth Proportional to 1,158,847.98, 1,599,213.78 and 642,638.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158,847.98 : 1,599,213.78 = 642,638.22 : x
2. Step 2: Convert to fraction form
   1,158,847.98/1,599,213.78 = 642,638.22/x
3. Step 3: Cross multiply
   1,158,847.98x = 1,599,213.78 × 642,638.22
4. Step 4: Simplify right side
   1,158,847.98x = 1,027,715,896,978.67
5. Step 5: Solve for x
   x = 1,027,715,896,978.67/1,158,847.98
6. Step 6: Final answer
   x = 886,842.72