Finding the Fourth Proportional to 1,415.94, 1,953.23 and 856.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,415.94 : 1,953.23 = 856.59 : x
2. Step 2: Convert to fraction form
   1,415.94/1,953.23 = 856.59/x
3. Step 3: Cross multiply
   1,415.94x = 1,953.23 × 856.59
4. Step 4: Simplify right side
   1,415.94x = 1,673,105.68
5. Step 5: Solve for x
   x = 1,673,105.68/1,415.94
6. Step 6: Final answer
   x = 1,181.63