Finding the Fourth Proportional to 1,570.10, 2,166.72 and 897.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.10 : 2,166.72 = 897.95 : x
2. Step 2: Convert to fraction form
   1,570.10/2,166.72 = 897.95/x
3. Step 3: Cross multiply
   1,570.10x = 2,166.72 × 897.95
4. Step 4: Simplify right side
   1,570.10x = 1,945,606.22
5. Step 5: Solve for x
   x = 1,945,606.22/1,570.10
6. Step 6: Final answer
   x = 1,239.16