Finding the Fourth Proportional to 1,359.20, 1,875.54 and 761.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.20 : 1,875.54 = 761.61 : x
2. Step 2: Convert to fraction form
   1,359.20/1,875.54 = 761.61/x
3. Step 3: Cross multiply
   1,359.20x = 1,875.54 × 761.61
4. Step 4: Simplify right side
   1,359.20x = 1,428,420.13
5. Step 5: Solve for x
   x = 1,428,420.13/1,359.20
6. Step 6: Final answer
   x = 1,050.93