Finding the Fourth Proportional to 1,109.78, 1,527.90 and 873.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.78 : 1,527.90 = 873.31 : x
2. Step 2: Convert to fraction form
   1,109.78/1,527.90 = 873.31/x
3. Step 3: Cross multiply
   1,109.78x = 1,527.90 × 873.31
4. Step 4: Simplify right side
   1,109.78x = 1,334,325.98
5. Step 5: Solve for x
   x = 1,334,325.98/1,109.78
6. Step 6: Final answer
   x = 1,202.33