Finding the Fourth Proportional to 1,380.77, 1,905.48 and 751.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.77 : 1,905.48 = 751.30 : x
2. Step 2: Convert to fraction form
   1,380.77/1,905.48 = 751.30/x
3. Step 3: Cross multiply
   1,380.77x = 1,905.48 × 751.30
4. Step 4: Simplify right side
   1,380.77x = 1,431,587.12
5. Step 5: Solve for x
   x = 1,431,587.12/1,380.77
6. Step 6: Final answer
   x = 1,036.80