Finding the Fourth Proportional to 1,090.47, 1,502.78 and 740.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,090.47 : 1,502.78 = 740.55 : x
2. Step 2: Convert to fraction form
   1,090.47/1,502.78 = 740.55/x
3. Step 3: Cross multiply
   1,090.47x = 1,502.78 × 740.55
4. Step 4: Simplify right side
   1,090.47x = 1,112,880.03
5. Step 5: Solve for x
   x = 1,112,880.03/1,090.47
6. Step 6: Final answer
   x = 1,020.55