Finding the Fourth Proportional to 1,111.24, 1,534.96 and 902.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.24 : 1,534.96 = 902.80 : x
2. Step 2: Convert to fraction form
   1,111.24/1,534.96 = 902.80/x
3. Step 3: Cross multiply
   1,111.24x = 1,534.96 × 902.80
4. Step 4: Simplify right side
   1,111.24x = 1,385,761.89
5. Step 5: Solve for x
   x = 1,385,761.89/1,111.24
6. Step 6: Final answer
   x = 1,247.04