Finding the Fourth Proportional to 1,570.17, 2,167.31 and 907.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.17 : 2,167.31 = 907.49 : x
2. Step 2: Convert to fraction form
   1,570.17/2,167.31 = 907.49/x
3. Step 3: Cross multiply
   1,570.17x = 2,167.31 × 907.49
4. Step 4: Simplify right side
   1,570.17x = 1,966,796.78
5. Step 5: Solve for x
   x = 1,966,796.78/1,570.17
6. Step 6: Final answer
   x = 1,252.60