Finding the Fourth Proportional to 1,210.55, 1,670.83 and 768.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,210.55 : 1,670.83 = 768.37 : x
2. Step 2: Convert to fraction form
   1,210.55/1,670.83 = 768.37/x
3. Step 3: Cross multiply
   1,210.55x = 1,670.83 × 768.37
4. Step 4: Simplify right side
   1,210.55x = 1,283,809.55
5. Step 5: Solve for x
   x = 1,283,809.55/1,210.55
6. Step 6: Final answer
   x = 1,060.52