Finding the Fourth Proportional to 1,111.80, 1,662.84 and 907.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.80 : 1,662.84 = 907.68 : x
2. Step 2: Convert to fraction form
   1,111.80/1,662.84 = 907.68/x
3. Step 3: Cross multiply
   1,111.80x = 1,662.84 × 907.68
4. Step 4: Simplify right side
   1,111.80x = 1,509,326.61
5. Step 5: Solve for x
   x = 1,509,326.61/1,111.80
6. Step 6: Final answer
   x = 1,357.55