Finding the Fourth Proportional to 1,909.86, 2,636.01 and 1,761.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,909.86 : 2,636.01 = 1,761.63 : x
2. Step 2: Convert to fraction form
   1,909.86/2,636.01 = 1,761.63/x
3. Step 3: Cross multiply
   1,909.86x = 2,636.01 × 1,761.63
4. Step 4: Simplify right side
   1,909.86x = 4,643,674.30
5. Step 5: Solve for x
   x = 4,643,674.30/1,909.86
6. Step 6: Final answer
   x = 2,431.42