Finding the Fourth Proportional to 1,388.29, 1,915.86 and 758.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.29 : 1,915.86 = 758.82 : x
2. Step 2: Convert to fraction form
   1,388.29/1,915.86 = 758.82/x
3. Step 3: Cross multiply
   1,388.29x = 1,915.86 × 758.82
4. Step 4: Simplify right side
   1,388.29x = 1,453,792.89
5. Step 5: Solve for x
   x = 1,453,792.89/1,388.29
6. Step 6: Final answer
   x = 1,047.18