Finding the Fourth Proportional to 1,158,665.80, 1,599,052.98 and 642,470.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158,665.80 : 1,599,052.98 = 642,470.92 : x
2. Step 2: Convert to fraction form
   1,158,665.80/1,599,052.98 = 642,470.92/x
3. Step 3: Cross multiply
   1,158,665.80x = 1,599,052.98 × 642,470.92
4. Step 4: Simplify right side
   1,158,665.80x = 1,027,345,039,189.34
5. Step 5: Solve for x
   x = 1,027,345,039,189.34/1,158,665.80
6. Step 6: Final answer
   x = 886,662.09