Finding the Fourth Proportional to 1,393.50, 2,090.50 and 528.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.50 : 2,090.50 = 528.42 : x
2. Step 2: Convert to fraction form
   1,393.50/2,090.50 = 528.42/x
3. Step 3: Cross multiply
   1,393.50x = 2,090.50 × 528.42
4. Step 4: Simplify right side
   1,393.50x = 1,104,662.01
5. Step 5: Solve for x
   x = 1,104,662.01/1,393.50
6. Step 6: Final answer
   x = 792.72