Finding the Fourth Proportional to 1,528.31, 2,109.25 and 907.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.31 : 2,109.25 = 907.31 : x
2. Step 2: Convert to fraction form
   1,528.31/2,109.25 = 907.31/x
3. Step 3: Cross multiply
   1,528.31x = 2,109.25 × 907.31
4. Step 4: Simplify right side
   1,528.31x = 1,913,750.02
5. Step 5: Solve for x
   x = 1,913,750.02/1,528.31
6. Step 6: Final answer
   x = 1,252.20