Finding the Fourth Proportional to 1,200.65, 1,656.78 and 886.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.65 : 1,656.78 = 886.09 : x
2. Step 2: Convert to fraction form
   1,200.65/1,656.78 = 886.09/x
3. Step 3: Cross multiply
   1,200.65x = 1,656.78 × 886.09
4. Step 4: Simplify right side
   1,200.65x = 1,468,050.60
5. Step 5: Solve for x
   x = 1,468,050.60/1,200.65
6. Step 6: Final answer
   x = 1,222.71