Finding the Fourth Proportional to 1,638.63, 2,261.72 and 1,010.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638.63 : 2,261.72 = 1,010.07 : x
2. Step 2: Convert to fraction form
   1,638.63/2,261.72 = 1,010.07/x
3. Step 3: Cross multiply
   1,638.63x = 2,261.72 × 1,010.07
4. Step 4: Simplify right side
   1,638.63x = 2,284,498.05
5. Step 5: Solve for x
   x = 2,284,498.05/1,638.63
6. Step 6: Final answer
   x = 1,394.15