Finding the Fourth Proportional to 1,388.77, 1,914.34 and 945.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.77 : 1,914.34 = 945.91 : x
2. Step 2: Convert to fraction form
   1,388.77/1,914.34 = 945.91/x
3. Step 3: Cross multiply
   1,388.77x = 1,914.34 × 945.91
4. Step 4: Simplify right side
   1,388.77x = 1,810,793.35
5. Step 5: Solve for x
   x = 1,810,793.35/1,388.77
6. Step 6: Final answer
   x = 1,303.88