Finding the Fourth Proportional to 1,570.55, 2,353.55 and 866.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.55 : 2,353.55 = 866.25 : x
2. Step 2: Convert to fraction form
   1,570.55/2,353.55 = 866.25/x
3. Step 3: Cross multiply
   1,570.55x = 2,353.55 × 866.25
4. Step 4: Simplify right side
   1,570.55x = 2,038,758.36
5. Step 5: Solve for x
   x = 2,038,758.36/1,570.55
6. Step 6: Final answer
   x = 1,298.12