Finding the Fourth Proportional to 1,570.79, 2,167.53 and 907.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.79 : 2,167.53 = 907.55 : x
2. Step 2: Convert to fraction form
   1,570.79/2,167.53 = 907.55/x
3. Step 3: Cross multiply
   1,570.79x = 2,167.53 × 907.55
4. Step 4: Simplify right side
   1,570.79x = 1,967,131.01
5. Step 5: Solve for x
   x = 1,967,131.01/1,570.79
6. Step 6: Final answer
   x = 1,252.32