Finding the Fourth Proportional to 1,636.61, 2,259.69 and 1,007.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.61 : 2,259.69 = 1,007.34 : x
2. Step 2: Convert to fraction form
   1,636.61/2,259.69 = 1,007.34/x
3. Step 3: Cross multiply
   1,636.61x = 2,259.69 × 1,007.34
4. Step 4: Simplify right side
   1,636.61x = 2,276,263.87
5. Step 5: Solve for x
   x = 2,276,263.87/1,636.61
6. Step 6: Final answer
   x = 1,390.84