Finding the Fourth Proportional to 1,393.52, 1,923.72 and 870.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.52 : 1,923.72 = 870.32 : x
2. Step 2: Convert to fraction form
   1,393.52/1,923.72 = 870.32/x
3. Step 3: Cross multiply
   1,393.52x = 1,923.72 × 870.32
4. Step 4: Simplify right side
   1,393.52x = 1,674,251.99
5. Step 5: Solve for x
   x = 1,674,251.99/1,393.52
6. Step 6: Final answer
   x = 1,201.46