Finding the Fourth Proportional to 1,780.78, 2,457.71 and 1,337.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.78 : 2,457.71 = 1,337.91 : x
2. Step 2: Convert to fraction form
   1,780.78/2,457.71 = 1,337.91/x
3. Step 3: Cross multiply
   1,780.78x = 2,457.71 × 1,337.91
4. Step 4: Simplify right side
   1,780.78x = 3,288,194.79
5. Step 5: Solve for x
   x = 3,288,194.79/1,780.78
6. Step 6: Final answer
   x = 1,846.50