Finding the Fourth Proportional to 1,397.02, 1,927.89 and 776.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.02 : 1,927.89 = 776.02 : x
2. Step 2: Convert to fraction form
   1,397.02/1,927.89 = 776.02/x
3. Step 3: Cross multiply
   1,397.02x = 1,927.89 × 776.02
4. Step 4: Simplify right side
   1,397.02x = 1,496,081.20
5. Step 5: Solve for x
   x = 1,496,081.20/1,397.02
6. Step 6: Final answer
   x = 1,070.91