Finding the Fourth Proportional to 1,899.79, 2,848.33 and 728.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,899.79 : 2,848.33 = 728.81 : x
2. Step 2: Convert to fraction form
   1,899.79/2,848.33 = 728.81/x
3. Step 3: Cross multiply
   1,899.79x = 2,848.33 × 728.81
4. Step 4: Simplify right side
   1,899.79x = 2,075,873.50
5. Step 5: Solve for x
   x = 2,075,873.50/1,899.79
6. Step 6: Final answer
   x = 1,092.69