Finding the Fourth Proportional to 1,385.34, 1,911.60 and 764.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.34 : 1,911.60 = 764.34 : x
2. Step 2: Convert to fraction form
   1,385.34/1,911.60 = 764.34/x
3. Step 3: Cross multiply
   1,385.34x = 1,911.60 × 764.34
4. Step 4: Simplify right side
   1,385.34x = 1,461,112.34
5. Step 5: Solve for x
   x = 1,461,112.34/1,385.34
6. Step 6: Final answer
   x = 1,054.70