Finding the Fourth Proportional to 1,151.01, 1,587.87 and 678.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,151.01 : 1,587.87 = 678.78 : x
2. Step 2: Convert to fraction form
   1,151.01/1,587.87 = 678.78/x
3. Step 3: Cross multiply
   1,151.01x = 1,587.87 × 678.78
4. Step 4: Simplify right side
   1,151.01x = 1,077,814.40
5. Step 5: Solve for x
   x = 1,077,814.40/1,151.01
6. Step 6: Final answer
   x = 936.41