Finding the Fourth Proportional to 1,781.72, 2,457.52 and 1,277.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,781.72 : 2,457.52 = 1,277.12 : x
2. Step 2: Convert to fraction form
   1,781.72/2,457.52 = 1,277.12/x
3. Step 3: Cross multiply
   1,781.72x = 2,457.52 × 1,277.12
4. Step 4: Simplify right side
   1,781.72x = 3,138,547.94
5. Step 5: Solve for x
   x = 3,138,547.94/1,781.72
6. Step 6: Final answer
   x = 1,761.53