Finding the Fourth Proportional to 1,388.32, 1,916.07 and 892.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.32 : 1,916.07 = 892.37 : x
2. Step 2: Convert to fraction form
   1,388.32/1,916.07 = 892.37/x
3. Step 3: Cross multiply
   1,388.32x = 1,916.07 × 892.37
4. Step 4: Simplify right side
   1,388.32x = 1,709,843.39
5. Step 5: Solve for x
   x = 1,709,843.39/1,388.32
6. Step 6: Final answer
   x = 1,231.60