Finding the Fourth Proportional to 1,385.10, 1,911.27 and 764.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.10 : 1,911.27 = 764.06 : x
2. Step 2: Convert to fraction form
   1,385.10/1,911.27 = 764.06/x
3. Step 3: Cross multiply
   1,385.10x = 1,911.27 × 764.06
4. Step 4: Simplify right side
   1,385.10x = 1,460,324.96
5. Step 5: Solve for x
   x = 1,460,324.96/1,385.10
6. Step 6: Final answer
   x = 1,054.31