Finding the Fourth Proportional to 1,501.78, 2,072.30 and 863.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,501.78 : 2,072.30 = 863.72 : x
2. Step 2: Convert to fraction form
   1,501.78/2,072.30 = 863.72/x
3. Step 3: Cross multiply
   1,501.78x = 2,072.30 × 863.72
4. Step 4: Simplify right side
   1,501.78x = 1,789,886.96
5. Step 5: Solve for x
   x = 1,789,886.96/1,501.78
6. Step 6: Final answer
   x = 1,191.84