Finding the Fourth Proportional to 1,385.07, 1,911.39 and 764.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.07 : 1,911.39 = 764.07 : x
2. Step 2: Convert to fraction form
   1,385.07/1,911.39 = 764.07/x
3. Step 3: Cross multiply
   1,385.07x = 1,911.39 × 764.07
4. Step 4: Simplify right side
   1,385.07x = 1,460,435.76
5. Step 5: Solve for x
   x = 1,460,435.76/1,385.07
6. Step 6: Final answer
   x = 1,054.41