Finding the Fourth Proportional to 1,397.06, 1,927.89 and 776.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.06 : 1,927.89 = 776.06 : x
2. Step 2: Convert to fraction form
   1,397.06/1,927.89 = 776.06/x
3. Step 3: Cross multiply
   1,397.06x = 1,927.89 × 776.06
4. Step 4: Simplify right side
   1,397.06x = 1,496,158.31
5. Step 5: Solve for x
   x = 1,496,158.31/1,397.06
6. Step 6: Final answer
   x = 1,070.93