Finding the Fourth Proportional to 1,553.83, 2,144.16 and 915.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,553.83 : 2,144.16 = 915.67 : x
2. Step 2: Convert to fraction form
   1,553.83/2,144.16 = 915.67/x
3. Step 3: Cross multiply
   1,553.83x = 2,144.16 × 915.67
4. Step 4: Simplify right side
   1,553.83x = 1,963,345.67
5. Step 5: Solve for x
   x = 1,963,345.67/1,553.83
6. Step 6: Final answer
   x = 1,263.55