Finding the Fourth Proportional to 1,381.48, 1,906.98 and 915.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.48 : 1,906.98 = 915.56 : x
2. Step 2: Convert to fraction form
   1,381.48/1,906.98 = 915.56/x
3. Step 3: Cross multiply
   1,381.48x = 1,906.98 × 915.56
4. Step 4: Simplify right side
   1,381.48x = 1,745,954.61
5. Step 5: Solve for x
   x = 1,745,954.61/1,381.48
6. Step 6: Final answer
   x = 1,263.83