Finding the Fourth Proportional to 1,128.76, 1,693.03 and 348.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.76 : 1,693.03 = 348.55 : x
2. Step 2: Convert to fraction form
   1,128.76/1,693.03 = 348.55/x
3. Step 3: Cross multiply
   1,128.76x = 1,693.03 × 348.55
4. Step 4: Simplify right side
   1,128.76x = 590,105.61
5. Step 5: Solve for x
   x = 590,105.61/1,128.76
6. Step 6: Final answer
   x = 522.79