Finding the Fourth Proportional to 1,091.07, 1,632.69 and 938.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.07 : 1,632.69 = 938.79 : x
2. Step 2: Convert to fraction form
   1,091.07/1,632.69 = 938.79/x
3. Step 3: Cross multiply
   1,091.07x = 1,632.69 × 938.79
4. Step 4: Simplify right side
   1,091.07x = 1,532,753.05
5. Step 5: Solve for x
   x = 1,532,753.05/1,091.07
6. Step 6: Final answer
   x = 1,404.82