Finding the Fourth Proportional to 1,385.88, 2,075.51 and 768.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.88 : 2,075.51 = 768.05 : x
2. Step 2: Convert to fraction form
   1,385.88/2,075.51 = 768.05/x
3. Step 3: Cross multiply
   1,385.88x = 2,075.51 × 768.05
4. Step 4: Simplify right side
   1,385.88x = 1,594,090.46
5. Step 5: Solve for x
   x = 1,594,090.46/1,385.88
6. Step 6: Final answer
   x = 1,150.24