Finding the Fourth Proportional to 1,359.09, 1,877.30 and 1,005.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.09 : 1,877.30 = 1,005.73 : x
2. Step 2: Convert to fraction form
   1,359.09/1,877.30 = 1,005.73/x
3. Step 3: Cross multiply
   1,359.09x = 1,877.30 × 1,005.73
4. Step 4: Simplify right side
   1,359.09x = 1,888,056.93
5. Step 5: Solve for x
   x = 1,888,056.93/1,359.09
6. Step 6: Final answer
   x = 1,389.21