Finding the Fourth Proportional to 1,111.32, 1,665.12 and 906

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.32 : 1,665.12 = 906 : x
2. Step 2: Convert to fraction form
   1,111.32/1,665.12 = 906/x
3. Step 3: Cross multiply
   1,111.32x = 1,665.12 × 906
4. Step 4: Simplify right side
   1,111.32x = 1,508,598.72
5. Step 5: Solve for x
   x = 1,508,598.72/1,111.32
6. Step 6: Final answer
   x = 1,357.48