Finding the Fourth Proportional to 1,054.80, 1,574.69 and 899.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,054.80 : 1,574.69 = 899.10 : x
2. Step 2: Convert to fraction form
   1,054.80/1,574.69 = 899.10/x
3. Step 3: Cross multiply
   1,054.80x = 1,574.69 × 899.10
4. Step 4: Simplify right side
   1,054.80x = 1,415,799.28
5. Step 5: Solve for x
   x = 1,415,799.28/1,054.80
6. Step 6: Final answer
   x = 1,342.24