Finding the Fourth Proportional to 1,415.98, 1,954.15 and 856.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,415.98 : 1,954.15 = 856.47 : x
2. Step 2: Convert to fraction form
   1,415.98/1,954.15 = 856.47/x
3. Step 3: Cross multiply
   1,415.98x = 1,954.15 × 856.47
4. Step 4: Simplify right side
   1,415.98x = 1,673,676.04
5. Step 5: Solve for x
   x = 1,673,676.04/1,415.98
6. Step 6: Final answer
   x = 1,181.99