Finding the Fourth Proportional to 2,505.01, 3,456.64 and 1,385.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,505.01 : 3,456.64 = 1,385.80 : x
2. Step 2: Convert to fraction form
   2,505.01/3,456.64 = 1,385.80/x
3. Step 3: Cross multiply
   2,505.01x = 3,456.64 × 1,385.80
4. Step 4: Simplify right side
   2,505.01x = 4,790,211.71
5. Step 5: Solve for x
   x = 4,790,211.71/2,505.01
6. Step 6: Final answer
   x = 1,912.25