Finding the Fourth Proportional to 1,515.32, 2,273.31 and 784.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,515.32 : 2,273.31 = 784.72 : x
2. Step 2: Convert to fraction form
   1,515.32/2,273.31 = 784.72/x
3. Step 3: Cross multiply
   1,515.32x = 2,273.31 × 784.72
4. Step 4: Simplify right side
   1,515.32x = 1,783,906.14
5. Step 5: Solve for x
   x = 1,783,906.14/1,515.32
6. Step 6: Final answer
   x = 1,177.25