Finding the Fourth Proportional to 1,856.34, 2,564.24 and 1,485.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,856.34 : 2,564.24 = 1,485.90 : x
2. Step 2: Convert to fraction form
   1,856.34/2,564.24 = 1,485.90/x
3. Step 3: Cross multiply
   1,856.34x = 2,564.24 × 1,485.90
4. Step 4: Simplify right side
   1,856.34x = 3,810,196.79
5. Step 5: Solve for x
   x = 3,810,196.79/1,856.34
6. Step 6: Final answer
   x = 2,052.53