Finding the Fourth Proportional to 1,210.42, 1,670.43 and 767.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,210.42 : 1,670.43 = 767.98 : x
2. Step 2: Convert to fraction form
   1,210.42/1,670.43 = 767.98/x
3. Step 3: Cross multiply
   1,210.42x = 1,670.43 × 767.98
4. Step 4: Simplify right side
   1,210.42x = 1,282,856.83
5. Step 5: Solve for x
   x = 1,282,856.83/1,210.42
6. Step 6: Final answer
   x = 1,059.84