Finding the Fourth Proportional to 2,987.72, 4,482.55 and 907.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,987.72 : 4,482.55 = 907.80 : x
2. Step 2: Convert to fraction form
   2,987.72/4,482.55 = 907.80/x
3. Step 3: Cross multiply
   2,987.72x = 4,482.55 × 907.80
4. Step 4: Simplify right side
   2,987.72x = 4,069,258.89
5. Step 5: Solve for x
   x = 4,069,258.89/2,987.72
6. Step 6: Final answer
   x = 1,362.00