Finding the Fourth Proportional to 1,641.42, 2,265.21 and 1,291.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,641.42 : 2,265.21 = 1,291.50 : x
2. Step 2: Convert to fraction form
   1,641.42/2,265.21 = 1,291.50/x
3. Step 3: Cross multiply
   1,641.42x = 2,265.21 × 1,291.50
4. Step 4: Simplify right side
   1,641.42x = 2,925,518.72
5. Step 5: Solve for x
   x = 2,925,518.72/1,641.42
6. Step 6: Final answer
   x = 1,782.31