Finding the Fourth Proportional to 1,447.31, 1,997.28 and 784.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,447.31 : 1,997.28 = 784.15 : x
2. Step 2: Convert to fraction form
   1,447.31/1,997.28 = 784.15/x
3. Step 3: Cross multiply
   1,447.31x = 1,997.28 × 784.15
4. Step 4: Simplify right side
   1,447.31x = 1,566,162.12
5. Step 5: Solve for x
   x = 1,566,162.12/1,447.31
6. Step 6: Final answer
   x = 1,082.12