Finding the Fourth Proportional to 1,399.98, 1,931.93 and 770.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.98 : 1,931.93 = 770.49 : x
2. Step 2: Convert to fraction form
   1,399.98/1,931.93 = 770.49/x
3. Step 3: Cross multiply
   1,399.98x = 1,931.93 × 770.49
4. Step 4: Simplify right side
   1,399.98x = 1,488,525.01
5. Step 5: Solve for x
   x = 1,488,525.01/1,399.98
6. Step 6: Final answer
   x = 1,063.25