Finding the Fourth Proportional to 1,139.67, 1,572.82 and 942.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.67 : 1,572.82 = 942.84 : x
2. Step 2: Convert to fraction form
   1,139.67/1,572.82 = 942.84/x
3. Step 3: Cross multiply
   1,139.67x = 1,572.82 × 942.84
4. Step 4: Simplify right side
   1,139.67x = 1,482,915.25
5. Step 5: Solve for x
   x = 1,482,915.25/1,139.67
6. Step 6: Final answer
   x = 1,301.18