Finding the Fourth Proportional to 1,472.78, 2,031.58 and 919.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,472.78 : 2,031.58 = 919.82 : x
2. Step 2: Convert to fraction form
   1,472.78/2,031.58 = 919.82/x
3. Step 3: Cross multiply
   1,472.78x = 2,031.58 × 919.82
4. Step 4: Simplify right side
   1,472.78x = 1,868,677.76
5. Step 5: Solve for x
   x = 1,868,677.76/1,472.78
6. Step 6: Final answer
   x = 1,268.81