Finding the Fourth Proportional to 1,385.31, 2,068.98 and 1,255.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.31 : 2,068.98 = 1,255.05 : x
2. Step 2: Convert to fraction form
   1,385.31/2,068.98 = 1,255.05/x
3. Step 3: Cross multiply
   1,385.31x = 2,068.98 × 1,255.05
4. Step 4: Simplify right side
   1,385.31x = 2,596,673.35
5. Step 5: Solve for x
   x = 2,596,673.35/1,385.31
6. Step 6: Final answer
   x = 1,874.43