Finding the Fourth Proportional to 1,388.33, 1,915.89 and 758.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.33 : 1,915.89 = 758.86 : x
2. Step 2: Convert to fraction form
   1,388.33/1,915.89 = 758.86/x
3. Step 3: Cross multiply
   1,388.33x = 1,915.89 × 758.86
4. Step 4: Simplify right side
   1,388.33x = 1,453,889.39
5. Step 5: Solve for x
   x = 1,453,889.39/1,388.33
6. Step 6: Final answer
   x = 1,047.22