Finding the Fourth Proportional to 1,570.50, 2,167.56 and 907.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.50 : 2,167.56 = 907.79 : x
2. Step 2: Convert to fraction form
   1,570.50/2,167.56 = 907.79/x
3. Step 3: Cross multiply
   1,570.50x = 2,167.56 × 907.79
4. Step 4: Simplify right side
   1,570.50x = 1,967,678.45
5. Step 5: Solve for x
   x = 1,967,678.45/1,570.50
6. Step 6: Final answer
   x = 1,252.90