Finding the Fourth Proportional to 1,061.31, 1,464.61 and 647.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.31 : 1,464.61 = 647.31 : x
2. Step 2: Convert to fraction form
   1,061.31/1,464.61 = 647.31/x
3. Step 3: Cross multiply
   1,061.31x = 1,464.61 × 647.31
4. Step 4: Simplify right side
   1,061.31x = 948,056.70
5. Step 5: Solve for x
   x = 948,056.70/1,061.31
6. Step 6: Final answer
   x = 893.29