Finding the Fourth Proportional to 1,377.20, 1,898.16 and 934.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.20 : 1,898.16 = 934.88 : x
2. Step 2: Convert to fraction form
   1,377.20/1,898.16 = 934.88/x
3. Step 3: Cross multiply
   1,377.20x = 1,898.16 × 934.88
4. Step 4: Simplify right side
   1,377.20x = 1,774,551.82
5. Step 5: Solve for x
   x = 1,774,551.82/1,377.20
6. Step 6: Final answer
   x = 1,288.52