Finding the Fourth Proportional to 1,111.05, 1,666.98 and 906.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.05 : 1,666.98 = 906.12 : x
2. Step 2: Convert to fraction form
   1,111.05/1,666.98 = 906.12/x
3. Step 3: Cross multiply
   1,111.05x = 1,666.98 × 906.12
4. Step 4: Simplify right side
   1,111.05x = 1,510,483.92
5. Step 5: Solve for x
   x = 1,510,483.92/1,111.05
6. Step 6: Final answer
   x = 1,359.51