Finding the Fourth Proportional to 1,613.52, 2,226.72 and 915.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,613.52 : 2,226.72 = 915.12 : x
2. Step 2: Convert to fraction form
   1,613.52/2,226.72 = 915.12/x
3. Step 3: Cross multiply
   1,613.52x = 2,226.72 × 915.12
4. Step 4: Simplify right side
   1,613.52x = 2,037,716.01
5. Step 5: Solve for x
   x = 2,037,716.01/1,613.52
6. Step 6: Final answer
   x = 1,262.90