Finding the Fourth Proportional to 1,781.21, 2,665.80 and 1,271.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,781.21 : 2,665.80 = 1,271.52 : x
2. Step 2: Convert to fraction form
   1,781.21/2,665.80 = 1,271.52/x
3. Step 3: Cross multiply
   1,781.21x = 2,665.80 × 1,271.52
4. Step 4: Simplify right side
   1,781.21x = 3,389,618.02
5. Step 5: Solve for x
   x = 3,389,618.02/1,781.21
6. Step 6: Final answer
   x = 1,902.99