Finding the Fourth Proportional to 1,040.38, 1,435.52 and 647.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,040.38 : 1,435.52 = 647.50 : x
2. Step 2: Convert to fraction form
   1,040.38/1,435.52 = 647.50/x
3. Step 3: Cross multiply
   1,040.38x = 1,435.52 × 647.50
4. Step 4: Simplify right side
   1,040.38x = 929,499.20
5. Step 5: Solve for x
   x = 929,499.20/1,040.38
6. Step 6: Final answer
   x = 893.42