Finding the Fourth Proportional to 1,072.31, 1,606.50 and 900.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.31 : 1,606.50 = 900.08 : x
2. Step 2: Convert to fraction form
   1,072.31/1,606.50 = 900.08/x
3. Step 3: Cross multiply
   1,072.31x = 1,606.50 × 900.08
4. Step 4: Simplify right side
   1,072.31x = 1,445,978.52
5. Step 5: Solve for x
   x = 1,445,978.52/1,072.31
6. Step 6: Final answer
   x = 1,348.47