Finding the Fourth Proportional to 1,077.86, 1,623.81 and 1,064.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,077.86 : 1,623.81 = 1,064.42 : x
2. Step 2: Convert to fraction form
   1,077.86/1,623.81 = 1,064.42/x
3. Step 3: Cross multiply
   1,077.86x = 1,623.81 × 1,064.42
4. Step 4: Simplify right side
   1,077.86x = 1,728,415.84
5. Step 5: Solve for x
   x = 1,728,415.84/1,077.86
6. Step 6: Final answer
   x = 1,603.56