Finding the Fourth Proportional to 1,753.31, 2,419.93 and 1,007.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,753.31 : 2,419.93 = 1,007.78 : x
2. Step 2: Convert to fraction form
   1,753.31/2,419.93 = 1,007.78/x
3. Step 3: Cross multiply
   1,753.31x = 2,419.93 × 1,007.78
4. Step 4: Simplify right side
   1,753.31x = 2,438,757.06
5. Step 5: Solve for x
   x = 2,438,757.06/1,753.31
6. Step 6: Final answer
   x = 1,390.94