Finding the Fourth Proportional to 1,113.72, 1,667.49 and 838.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,113.72 : 1,667.49 = 838.98 : x
2. Step 2: Convert to fraction form
   1,113.72/1,667.49 = 838.98/x
3. Step 3: Cross multiply
   1,113.72x = 1,667.49 × 838.98
4. Step 4: Simplify right side
   1,113.72x = 1,398,990.76
5. Step 5: Solve for x
   x = 1,398,990.76/1,113.72
6. Step 6: Final answer
   x = 1,256.14