Finding the Fourth Proportional to 1,385.82, 1,912.42 and 764.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.82 : 1,912.42 = 764.82 : x
2. Step 2: Convert to fraction form
   1,385.82/1,912.42 = 764.82/x
3. Step 3: Cross multiply
   1,385.82x = 1,912.42 × 764.82
4. Step 4: Simplify right side
   1,385.82x = 1,462,657.06
5. Step 5: Solve for x
   x = 1,462,657.06/1,385.82
6. Step 6: Final answer
   x = 1,055.45