Finding the Fourth Proportional to 1,529.78, 2,111.31 and 900.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,529.78 : 2,111.31 = 900.53 : x
2. Step 2: Convert to fraction form
   1,529.78/2,111.31 = 900.53/x
3. Step 3: Cross multiply
   1,529.78x = 2,111.31 × 900.53
4. Step 4: Simplify right side
   1,529.78x = 1,901,287.44
5. Step 5: Solve for x
   x = 1,901,287.44/1,529.78
6. Step 6: Final answer
   x = 1,242.85