Finding the Fourth Proportional to 1,388.47, 1,916.65 and 946.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.47 : 1,916.65 = 946.82 : x
2. Step 2: Convert to fraction form
   1,388.47/1,916.65 = 946.82/x
3. Step 3: Cross multiply
   1,388.47x = 1,916.65 × 946.82
4. Step 4: Simplify right side
   1,388.47x = 1,814,722.55
5. Step 5: Solve for x
   x = 1,814,722.55/1,388.47
6. Step 6: Final answer
   x = 1,306.99