Finding the Fourth Proportional to 2,889.50, 4,334.78 and 915.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,889.50 : 4,334.78 = 915.63 : x
2. Step 2: Convert to fraction form
   2,889.50/4,334.78 = 915.63/x
3. Step 3: Cross multiply
   2,889.50x = 4,334.78 × 915.63
4. Step 4: Simplify right side
   2,889.50x = 3,969,054.61
5. Step 5: Solve for x
   x = 3,969,054.61/2,889.50
6. Step 6: Final answer
   x = 1,373.61