Finding the Fourth Proportional to 1,451.86, 1,991.23 and 1,392.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,451.86 : 1,991.23 = 1,392.34 : x
2. Step 2: Convert to fraction form
   1,451.86/1,991.23 = 1,392.34/x
3. Step 3: Cross multiply
   1,451.86x = 1,991.23 × 1,392.34
4. Step 4: Simplify right side
   1,451.86x = 2,772,469.18
5. Step 5: Solve for x
   x = 2,772,469.18/1,451.86
6. Step 6: Final answer
   x = 1,909.60