Finding the Fourth Proportional to 1,069.56, 1,601.67 and 915.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,069.56 : 1,601.67 = 915.25 : x
2. Step 2: Convert to fraction form
   1,069.56/1,601.67 = 915.25/x
3. Step 3: Cross multiply
   1,069.56x = 1,601.67 × 915.25
4. Step 4: Simplify right side
   1,069.56x = 1,465,928.47
5. Step 5: Solve for x
   x = 1,465,928.47/1,069.56
6. Step 6: Final answer
   x = 1,370.59