Finding the Fourth Proportional to 2,069.96, 3,105.90 and 915.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,069.96 : 3,105.90 = 915.56 : x
2. Step 2: Convert to fraction form
   2,069.96/3,105.90 = 915.56/x
3. Step 3: Cross multiply
   2,069.96x = 3,105.90 × 915.56
4. Step 4: Simplify right side
   2,069.96x = 2,843,637.80
5. Step 5: Solve for x
   x = 2,843,637.80/2,069.96
6. Step 6: Final answer
   x = 1,373.76