Finding the Fourth Proportional to 1,111.07, 1,661.73 and 906.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.07 : 1,661.73 = 906.95 : x
2. Step 2: Convert to fraction form
   1,111.07/1,661.73 = 906.95/x
3. Step 3: Cross multiply
   1,111.07x = 1,661.73 × 906.95
4. Step 4: Simplify right side
   1,111.07x = 1,507,097.71
5. Step 5: Solve for x
   x = 1,507,097.71/1,111.07
6. Step 6: Final answer
   x = 1,356.44