Finding the Fourth Proportional to 2,055.60, 3,080.52 and 900.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,055.60 : 3,080.52 = 900.72 : x
2. Step 2: Convert to fraction form
   2,055.60/3,080.52 = 900.72/x
3. Step 3: Cross multiply
   2,055.60x = 3,080.52 × 900.72
4. Step 4: Simplify right side
   2,055.60x = 2,774,685.97
5. Step 5: Solve for x
   x = 2,774,685.97/2,055.60
6. Step 6: Final answer
   x = 1,349.82