Finding the Fourth Proportional to 1,359.12, 1,875.52 and 769.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.12 : 1,875.52 = 769.60 : x
2. Step 2: Convert to fraction form
   1,359.12/1,875.52 = 769.60/x
3. Step 3: Cross multiply
   1,359.12x = 1,875.52 × 769.60
4. Step 4: Simplify right side
   1,359.12x = 1,443,400.19
5. Step 5: Solve for x
   x = 1,443,400.19/1,359.12
6. Step 6: Final answer
   x = 1,062.01