Finding the Fourth Proportional to 1,378.84, 1,901.82 and 913.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378.84 : 1,901.82 = 913.72 : x
2. Step 2: Convert to fraction form
   1,378.84/1,901.82 = 913.72/x
3. Step 3: Cross multiply
   1,378.84x = 1,901.82 × 913.72
4. Step 4: Simplify right side
   1,378.84x = 1,737,730.97
5. Step 5: Solve for x
   x = 1,737,730.97/1,378.84
6. Step 6: Final answer
   x = 1,260.28