Finding the Fourth Proportional to 1,051.15, 1,449.39 and 861.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,051.15 : 1,449.39 = 861.50 : x
2. Step 2: Convert to fraction form
   1,051.15/1,449.39 = 861.50/x
3. Step 3: Cross multiply
   1,051.15x = 1,449.39 × 861.50
4. Step 4: Simplify right side
   1,051.15x = 1,248,649.49
5. Step 5: Solve for x
   x = 1,248,649.49/1,051.15
6. Step 6: Final answer
   x = 1,187.89