Finding the Fourth Proportional to 1,091.72, 1,501.98 and 903.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.72 : 1,501.98 = 903.08 : x
2. Step 2: Convert to fraction form
   1,091.72/1,501.98 = 903.08/x
3. Step 3: Cross multiply
   1,091.72x = 1,501.98 × 903.08
4. Step 4: Simplify right side
   1,091.72x = 1,356,408.10
5. Step 5: Solve for x
   x = 1,356,408.10/1,091.72
6. Step 6: Final answer
   x = 1,242.45