Finding the Fourth Proportional to 1,005.39, 1,390.01 and 757.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,005.39 : 1,390.01 = 757.98 : x
2. Step 2: Convert to fraction form
   1,005.39/1,390.01 = 757.98/x
3. Step 3: Cross multiply
   1,005.39x = 1,390.01 × 757.98
4. Step 4: Simplify right side
   1,005.39x = 1,053,599.78
5. Step 5: Solve for x
   x = 1,053,599.78/1,005.39
6. Step 6: Final answer
   x = 1,047.95