Finding the Fourth Proportional to 1,401.60, 2,104.32 and 915.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.60 : 2,104.32 = 915.84 : x
2. Step 2: Convert to fraction form
   1,401.60/2,104.32 = 915.84/x
3. Step 3: Cross multiply
   1,401.60x = 2,104.32 × 915.84
4. Step 4: Simplify right side
   1,401.60x = 1,927,220.43
5. Step 5: Solve for x
   x = 1,927,220.43/1,401.60
6. Step 6: Final answer
   x = 1,375.01