Finding the Fourth Proportional to 2,646.56, 3,969.72 and 915.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,646.56 : 3,969.72 = 915.32 : x
2. Step 2: Convert to fraction form
   2,646.56/3,969.72 = 915.32/x
3. Step 3: Cross multiply
   2,646.56x = 3,969.72 × 915.32
4. Step 4: Simplify right side
   2,646.56x = 3,633,564.11
5. Step 5: Solve for x
   x = 3,633,564.11/2,646.56
6. Step 6: Final answer
   x = 1,372.94