Finding the Fourth Proportional to 1,298.76, 1,791.06 and 774.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,298.76 : 1,791.06 = 774.72 : x
2. Step 2: Convert to fraction form
   1,298.76/1,791.06 = 774.72/x
3. Step 3: Cross multiply
   1,298.76x = 1,791.06 × 774.72
4. Step 4: Simplify right side
   1,298.76x = 1,387,570.00
5. Step 5: Solve for x
   x = 1,387,570.00/1,298.76
6. Step 6: Final answer
   x = 1,068.38