Finding the Fourth Proportional to 1,359.84, 1,875.28 and 912.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.84 : 1,875.28 = 912.72 : x
2. Step 2: Convert to fraction form
   1,359.84/1,875.28 = 912.72/x
3. Step 3: Cross multiply
   1,359.84x = 1,875.28 × 912.72
4. Step 4: Simplify right side
   1,359.84x = 1,711,605.56
5. Step 5: Solve for x
   x = 1,711,605.56/1,359.84
6. Step 6: Final answer
   x = 1,258.68