Finding the Fourth Proportional to 1,398.70, 1,931.61 and 1,152.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.70 : 1,931.61 = 1,152.46 : x
2. Step 2: Convert to fraction form
   1,398.70/1,931.61 = 1,152.46/x
3. Step 3: Cross multiply
   1,398.70x = 1,931.61 × 1,152.46
4. Step 4: Simplify right side
   1,398.70x = 2,226,103.26
5. Step 5: Solve for x
   x = 2,226,103.26/1,398.70
6. Step 6: Final answer
   x = 1,591.55